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Finding the Fourth Proportional to 398,520.90, 549,951.68 and 217,234.38

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Solution

The fourth proportional to 398,520.90, 549,951.68 and 217,234.38 is: 299,779.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,520.90 : 549,951.68 = 217,234.38 : x
  2. Step 2: Convert to fraction form
    398,520.90/549,951.68 = 217,234.38/x
  3. Step 3: Cross multiply
    398,520.90x = 549,951.68 × 217,234.38
  4. Step 4: Simplify right side
    398,520.90x = 119,468,412,234.76
  5. Step 5: Solve for x
    x = 119,468,412,234.76/398,520.90
  6. Step 6: Final answer
    x = 299,779.54

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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.