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Finding the Fourth Proportional to 390,171.90, 538,480.92 and 220,416.96

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Solution

The fourth proportional to 390,171.90, 538,480.92 and 220,416.96 is: 304,200.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,171.90 : 538,480.92 = 220,416.96 : x
  2. Step 2: Convert to fraction form
    390,171.90/538,480.92 = 220,416.96/x
  3. Step 3: Cross multiply
    390,171.90x = 538,480.92 × 220,416.96
  4. Step 4: Simplify right side
    390,171.90x = 118,690,327,404.40
  5. Step 5: Solve for x
    x = 118,690,327,404.40/390,171.90
  6. Step 6: Final answer
    x = 304,200.09

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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.