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Finding the Fourth Proportional to 12,346.70, 18,520.05 and 7,421.90

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Solution

The fourth proportional to 12,346.70, 18,520.05 and 7,421.90 is: 11,132.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,346.70 : 18,520.05 = 7,421.90 : x
  2. Step 2: Convert to fraction form
    12,346.70/18,520.05 = 7,421.90/x
  3. Step 3: Cross multiply
    12,346.70x = 18,520.05 × 7,421.90
  4. Step 4: Simplify right side
    12,346.70x = 137,453,959.10
  5. Step 5: Solve for x
    x = 137,453,959.10/12,346.70
  6. Step 6: Final answer
    x = 11,132.85

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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.