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Finding the Fourth Proportional to 498,221.58, 687,238.92 and 355,027.89

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Solution

The fourth proportional to 498,221.58, 687,238.92 and 355,027.89 is: 489,719.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    498,221.58 : 687,238.92 = 355,027.89 : x
  2. Step 2: Convert to fraction form
    498,221.58/687,238.92 = 355,027.89/x
  3. Step 3: Cross multiply
    498,221.58x = 687,238.92 × 355,027.89
  4. Step 4: Simplify right side
    498,221.58x = 243,988,983,693.48
  5. Step 5: Solve for x
    x = 243,988,983,693.48/498,221.58
  6. Step 6: Final answer
    x = 489,719.82

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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.