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Finding the Fourth Proportional to 398,414.72, 549,805.20 and 217,125.56

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Solution

The fourth proportional to 398,414.72, 549,805.20 and 217,125.56 is: 299,629.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,414.72 : 549,805.20 = 217,125.56 : x
  2. Step 2: Convert to fraction form
    398,414.72/549,805.20 = 217,125.56/x
  3. Step 3: Cross multiply
    398,414.72x = 549,805.20 × 217,125.56
  4. Step 4: Simplify right side
    398,414.72x = 119,376,761,940.91
  5. Step 5: Solve for x
    x = 119,376,761,940.91/398,414.72
  6. Step 6: Final answer
    x = 299,629.40

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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.