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Finding the Fourth Proportional to 290,049.88, 435,086.48 and 138,168.88

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Solution

The fourth proportional to 290,049.88, 435,086.48 and 138,168.88 is: 207,258.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,049.88 : 435,086.48 = 138,168.88 : x
  2. Step 2: Convert to fraction form
    290,049.88/435,086.48 = 138,168.88/x
  3. Step 3: Cross multiply
    290,049.88x = 435,086.48 × 138,168.88
  4. Step 4: Simplify right side
    290,049.88x = 60,115,411,990.16
  5. Step 5: Solve for x
    x = 60,115,411,990.16/290,049.88
  6. Step 6: Final answer
    x = 207,258.88

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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.