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Finding the Fourth Proportional to 86,432.66, 129,698.19 and 69,013.20

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Solution

The fourth proportional to 86,432.66, 129,698.19 and 69,013.20 is: 103,559.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,432.66 : 129,698.19 = 69,013.20 : x
  2. Step 2: Convert to fraction form
    86,432.66/129,698.19 = 69,013.20/x
  3. Step 3: Cross multiply
    86,432.66x = 129,698.19 × 69,013.20
  4. Step 4: Simplify right side
    86,432.66x = 8,950,887,126.11
  5. Step 5: Solve for x
    x = 8,950,887,126.11/86,432.66
  6. Step 6: Final answer
    x = 103,559.09

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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.