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Finding the Fourth Proportional to 310,693.12, 428,583.36 and 215,255.68

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Solution

The fourth proportional to 310,693.12, 428,583.36 and 215,255.68 is: 296,932.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,693.12 : 428,583.36 = 215,255.68 : x
  2. Step 2: Convert to fraction form
    310,693.12/428,583.36 = 215,255.68/x
  3. Step 3: Cross multiply
    310,693.12x = 428,583.36 × 215,255.68
  4. Step 4: Simplify right side
    310,693.12x = 92,255,002,593.48
  5. Step 5: Solve for x
    x = 92,255,002,593.48/310,693.12
  6. Step 6: Final answer
    x = 296,932.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.