Home / 142,132.76-196,143.50-78,470.68

Finding the Fourth Proportional to 142,132.76, 196,143.50 and 78,470.68

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Solution

The fourth proportional to 142,132.76, 196,143.50 and 78,470.68 is: 108,289.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    142,132.76 : 196,143.50 = 78,470.68 : x
  2. Step 2: Convert to fraction form
    142,132.76/196,143.50 = 78,470.68/x
  3. Step 3: Cross multiply
    142,132.76x = 196,143.50 × 78,470.68
  4. Step 4: Simplify right side
    142,132.76x = 15,391,513,822.58
  5. Step 5: Solve for x
    x = 15,391,513,822.58/142,132.76
  6. Step 6: Final answer
    x = 108,289.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.