Home / 12,385.60-18,578.40-4,991.20

Finding the Fourth Proportional to 12,385.60, 18,578.40 and 4,991.20

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Solution

The fourth proportional to 12,385.60, 18,578.40 and 4,991.20 is: 7,486.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,385.60 : 18,578.40 = 4,991.20 : x
  2. Step 2: Convert to fraction form
    12,385.60/18,578.40 = 4,991.20/x
  3. Step 3: Cross multiply
    12,385.60x = 18,578.40 × 4,991.20
  4. Step 4: Simplify right side
    12,385.60x = 92,728,510.08
  5. Step 5: Solve for x
    x = 92,728,510.08/12,385.60
  6. Step 6: Final answer
    x = 7,486.80

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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.