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Finding the Fourth Proportional to 87,391.65, 130,494.70 and 69,420.59

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Solution

The fourth proportional to 87,391.65, 130,494.70 and 69,420.59 is: 103,660.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,391.65 : 130,494.70 = 69,420.59 : x
  2. Step 2: Convert to fraction form
    87,391.65/130,494.70 = 69,420.59/x
  3. Step 3: Cross multiply
    87,391.65x = 130,494.70 × 69,420.59
  4. Step 4: Simplify right side
    87,391.65x = 9,059,019,065.87
  5. Step 5: Solve for x
    x = 9,059,019,065.87/87,391.65
  6. Step 6: Final answer
    x = 103,660.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.