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Finding the Fourth Proportional to 12,385.70, 18,578.55 and 11,132.90

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Solution

The fourth proportional to 12,385.70, 18,578.55 and 11,132.90 is: 16,699.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,385.70 : 18,578.55 = 11,132.90 : x
  2. Step 2: Convert to fraction form
    12,385.70/18,578.55 = 11,132.90/x
  3. Step 3: Cross multiply
    12,385.70x = 18,578.55 × 11,132.90
  4. Step 4: Simplify right side
    12,385.70x = 206,833,139.30
  5. Step 5: Solve for x
    x = 206,833,139.30/12,385.70
  6. Step 6: Final answer
    x = 16,699.35

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.