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Finding the Fourth Proportional to 261,058.40, 391,280.40 and 136,335.20

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Solution

The fourth proportional to 261,058.40, 391,280.40 and 136,335.20 is: 204,342.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,058.40 : 391,280.40 = 136,335.20 : x
  2. Step 2: Convert to fraction form
    261,058.40/391,280.40 = 136,335.20/x
  3. Step 3: Cross multiply
    261,058.40x = 391,280.40 × 136,335.20
  4. Step 4: Simplify right side
    261,058.40x = 53,345,291,590.08
  5. Step 5: Solve for x
    x = 53,345,291,590.08/261,058.40
  6. Step 6: Final answer
    x = 204,342.37

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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.