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Finding the Fourth Proportional to 261,455.65, 392,138.33 and 69,331.41

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Solution

The fourth proportional to 261,455.65, 392,138.33 and 69,331.41 is: 103,985.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,455.65 : 392,138.33 = 69,331.41 : x
  2. Step 2: Convert to fraction form
    261,455.65/392,138.33 = 69,331.41/x
  3. Step 3: Cross multiply
    261,455.65x = 392,138.33 × 69,331.41
  4. Step 4: Simplify right side
    261,455.65x = 27,187,502,987.29
  5. Step 5: Solve for x
    x = 27,187,502,987.29/261,455.65
  6. Step 6: Final answer
    x = 103,985.14

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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.