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Finding the Fourth Proportional to 398,557.80, 549,989.39 and 217,251.86

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Solution

The fourth proportional to 398,557.80, 549,989.39 and 217,251.86 is: 299,796.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,557.80 : 549,989.39 = 217,251.86 : x
  2. Step 2: Convert to fraction form
    398,557.80/549,989.39 = 217,251.86/x
  3. Step 3: Cross multiply
    398,557.80x = 549,989.39 × 217,251.86
  4. Step 4: Simplify right side
    398,557.80x = 119,486,214,121.56
  5. Step 5: Solve for x
    x = 119,486,214,121.56/398,557.80
  6. Step 6: Final answer
    x = 299,796.45

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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.