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Finding the Fourth Proportional to 86,488.90, 129,723.69 and 23,315.31

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Solution

The fourth proportional to 86,488.90, 129,723.69 and 23,315.31 is: 34,970.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,488.90 : 129,723.69 = 23,315.31 : x
  2. Step 2: Convert to fraction form
    86,488.90/129,723.69 = 23,315.31/x
  3. Step 3: Cross multiply
    86,488.90x = 129,723.69 × 23,315.31
  4. Step 4: Simplify right side
    86,488.90x = 3,024,548,134.13
  5. Step 5: Solve for x
    x = 3,024,548,134.13/86,488.90
  6. Step 6: Final answer
    x = 34,970.36

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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.