Home / 86,431.89-129,689.76-39,079.71

Finding the Fourth Proportional to 86,431.89, 129,689.76 and 39,079.71

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Solution

The fourth proportional to 86,431.89, 129,689.76 and 39,079.71 is: 58,638.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,431.89 : 129,689.76 = 39,079.71 : x
  2. Step 2: Convert to fraction form
    86,431.89/129,689.76 = 39,079.71/x
  3. Step 3: Cross multiply
    86,431.89x = 129,689.76 × 39,079.71
  4. Step 4: Simplify right side
    86,431.89x = 5,068,238,210.77
  5. Step 5: Solve for x
    x = 5,068,238,210.77/86,431.89
  6. Step 6: Final answer
    x = 58,638.52

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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.