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Finding the Fourth Proportional to 87,318.69, 130,978.94 and 69,899.25

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Solution

The fourth proportional to 87,318.69, 130,978.94 and 69,899.25 is: 104,849.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,318.69 : 130,978.94 = 69,899.25 : x
  2. Step 2: Convert to fraction form
    87,318.69/130,978.94 = 69,899.25/x
  3. Step 3: Cross multiply
    87,318.69x = 130,978.94 × 69,899.25
  4. Step 4: Simplify right side
    87,318.69x = 9,155,329,671.80
  5. Step 5: Solve for x
    x = 9,155,329,671.80/87,318.69
  6. Step 6: Final answer
    x = 104,849.60

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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.