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Finding the Fourth Proportional to 87,008.31, 130,379.61 and 64,713.87

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Solution

The fourth proportional to 87,008.31, 130,379.61 and 64,713.87 is: 96,971.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,008.31 : 130,379.61 = 64,713.87 : x
  2. Step 2: Convert to fraction form
    87,008.31/130,379.61 = 64,713.87/x
  3. Step 3: Cross multiply
    87,008.31x = 130,379.61 × 64,713.87
  4. Step 4: Simplify right side
    87,008.31x = 8,437,369,132.19
  5. Step 5: Solve for x
    x = 8,437,369,132.19/87,008.31
  6. Step 6: Final answer
    x = 96,971.99

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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.