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Finding the Fourth Proportional to 86,664, 129,979.56 and 42,246.08

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Solution

The fourth proportional to 86,664, 129,979.56 and 42,246.08 is: 63,361.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,664 : 129,979.56 = 42,246.08 : x
  2. Step 2: Convert to fraction form
    86,664/129,979.56 = 42,246.08/x
  3. Step 3: Cross multiply
    86,664x = 129,979.56 × 42,246.08
  4. Step 4: Simplify right side
    86,664x = 5,491,126,890.12
  5. Step 5: Solve for x
    x = 5,491,126,890.12/86,664
  6. Step 6: Final answer
    x = 63,361.11

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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.