Home / 129,343.48-178,490.31-71,981.89

Finding the Fourth Proportional to 129,343.48, 178,490.31 and 71,981.89

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Solution

The fourth proportional to 129,343.48, 178,490.31 and 71,981.89 is: 99,332.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,343.48 : 178,490.31 = 71,981.89 : x
  2. Step 2: Convert to fraction form
    129,343.48/178,490.31 = 71,981.89/x
  3. Step 3: Cross multiply
    129,343.48x = 178,490.31 × 71,981.89
  4. Step 4: Simplify right side
    129,343.48x = 12,848,069,860.49
  5. Step 5: Solve for x
    x = 12,848,069,860.49/129,343.48
  6. Step 6: Final answer
    x = 99,332.95

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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.