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Finding the Fourth Proportional to 391,456.32, 540,176.72 and 217,031.18

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Solution

The fourth proportional to 391,456.32, 540,176.72 and 217,031.18 is: 299,484.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,456.32 : 540,176.72 = 217,031.18 : x
  2. Step 2: Convert to fraction form
    391,456.32/540,176.72 = 217,031.18/x
  3. Step 3: Cross multiply
    391,456.32x = 540,176.72 × 217,031.18
  4. Step 4: Simplify right side
    391,456.32x = 117,235,190,950.13
  5. Step 5: Solve for x
    x = 117,235,190,950.13/391,456.32
  6. Step 6: Final answer
    x = 299,484.73

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1.5x scale

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.