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Finding the Fourth Proportional to 142,498.80, 213,640.20 and 72,428.40

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Solution

The fourth proportional to 142,498.80, 213,640.20 and 72,428.40 is: 108,587.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,498.80 : 213,640.20 = 72,428.40 : x
  2. Step 2: Convert to fraction form
    142,498.80/213,640.20 = 72,428.40/x
  3. Step 3: Cross multiply
    142,498.80x = 213,640.20 × 72,428.40
  4. Step 4: Simplify right side
    142,498.80x = 15,473,617,861.68
  5. Step 5: Solve for x
    x = 15,473,617,861.68/142,498.80
  6. Step 6: Final answer
    x = 108,587.71

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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.