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Finding the Fourth Proportional to 285,556.80, 428,335.20 and 272,434.80

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Solution

The fourth proportional to 285,556.80, 428,335.20 and 272,434.80 is: 408,652.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    285,556.80 : 428,335.20 = 272,434.80 : x
  2. Step 2: Convert to fraction form
    285,556.80/428,335.20 = 272,434.80/x
  3. Step 3: Cross multiply
    285,556.80x = 428,335.20 × 272,434.80
  4. Step 4: Simplify right side
    285,556.80x = 116,693,414,544.96
  5. Step 5: Solve for x
    x = 116,693,414,544.96/285,556.80
  6. Step 6: Final answer
    x = 408,652.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.