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Finding the Fourth Proportional to 390,879.52, 539,422.86 and 218,793.20

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Solution

The fourth proportional to 390,879.52, 539,422.86 and 218,793.20 is: 301,939.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,879.52 : 539,422.86 = 218,793.20 : x
  2. Step 2: Convert to fraction form
    390,879.52/539,422.86 = 218,793.20/x
  3. Step 3: Cross multiply
    390,879.52x = 539,422.86 × 218,793.20
  4. Step 4: Simplify right side
    390,879.52x = 118,022,053,692.55
  5. Step 5: Solve for x
    x = 118,022,053,692.55/390,879.52
  6. Step 6: Final answer
    x = 301,939.72

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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.