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Finding the Fourth Proportional to 142,078.80, 213,010.20 and 72,008.40

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Solution

The fourth proportional to 142,078.80, 213,010.20 and 72,008.40 is: 107,957.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,078.80 : 213,010.20 = 72,008.40 : x
  2. Step 2: Convert to fraction form
    142,078.80/213,010.20 = 72,008.40/x
  3. Step 3: Cross multiply
    142,078.80x = 213,010.20 × 72,008.40
  4. Step 4: Simplify right side
    142,078.80x = 15,338,523,685.68
  5. Step 5: Solve for x
    x = 15,338,523,685.68/142,078.80
  6. Step 6: Final answer
    x = 107,957.86

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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.