Home / 129,501.12-178,717.92-72,918.72

Finding the Fourth Proportional to 129,501.12, 178,717.92 and 72,918.72

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Solution

The fourth proportional to 129,501.12, 178,717.92 and 72,918.72 is: 100,631.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,501.12 : 178,717.92 = 72,918.72 : x
  2. Step 2: Convert to fraction form
    129,501.12/178,717.92 = 72,918.72/x
  3. Step 3: Cross multiply
    129,501.12x = 178,717.92 × 72,918.72
  4. Step 4: Simplify right side
    129,501.12x = 13,031,881,967.46
  5. Step 5: Solve for x
    x = 13,031,881,967.46/129,501.12
  6. Step 6: Final answer
    x = 100,631.42

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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.