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Finding the Fourth Proportional to 398,306.48, 549,656.52 and 217,020.80

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Solution

The fourth proportional to 398,306.48, 549,656.52 and 217,020.80 is: 299,485.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,306.48 : 549,656.52 = 217,020.80 : x
  2. Step 2: Convert to fraction form
    398,306.48/549,656.52 = 217,020.80/x
  3. Step 3: Cross multiply
    398,306.48x = 549,656.52 × 217,020.80
  4. Step 4: Simplify right side
    398,306.48x = 119,286,897,695.62
  5. Step 5: Solve for x
    x = 119,286,897,695.62/398,306.48
  6. Step 6: Final answer
    x = 299,485.20

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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.