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Finding the Fourth Proportional to 87,390.65, 130,493.21 and 69,419.59

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Solution

The fourth proportional to 87,390.65, 130,493.21 and 69,419.59 is: 103,658.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,390.65 : 130,493.21 = 69,419.59 : x
  2. Step 2: Convert to fraction form
    87,390.65/130,493.21 = 69,419.59/x
  3. Step 3: Cross multiply
    87,390.65x = 130,493.21 × 69,419.59
  4. Step 4: Simplify right side
    87,390.65x = 9,058,784,462.65
  5. Step 5: Solve for x
    x = 9,058,784,462.65/87,390.65
  6. Step 6: Final answer
    x = 103,658.51

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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.