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Finding the Fourth Proportional to 86,668.90, 129,914.15 and 42,240.69

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Solution

The fourth proportional to 86,668.90, 129,914.15 and 42,240.69 is: 63,317.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,668.90 : 129,914.15 = 42,240.69 : x
  2. Step 2: Convert to fraction form
    86,668.90/129,914.15 = 42,240.69/x
  3. Step 3: Cross multiply
    86,668.90x = 129,914.15 × 42,240.69
  4. Step 4: Simplify right side
    86,668.90x = 5,487,663,125.56
  5. Step 5: Solve for x
    x = 5,487,663,125.56/86,668.90
  6. Step 6: Final answer
    x = 63,317.56

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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.