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Finding the Fourth Proportional to 458,128.80, 687,337.20 and 221,479.20

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Solution

The fourth proportional to 458,128.80, 687,337.20 and 221,479.20 is: 332,288.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    458,128.80 : 687,337.20 = 221,479.20 : x
  2. Step 2: Convert to fraction form
    458,128.80/687,337.20 = 221,479.20/x
  3. Step 3: Cross multiply
    458,128.80x = 687,337.20 × 221,479.20
  4. Step 4: Simplify right side
    458,128.80x = 152,230,893,186.24
  5. Step 5: Solve for x
    x = 152,230,893,186.24/458,128.80
  6. Step 6: Final answer
    x = 332,288.42

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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.