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Finding the Fourth Proportional to 999.55, 1,498.31 and 478.79

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Solution

The fourth proportional to 999.55, 1,498.31 and 478.79 is: 717.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.55 : 1,498.31 = 478.79 : x
  2. Step 2: Convert to fraction form
    999.55/1,498.31 = 478.79/x
  3. Step 3: Cross multiply
    999.55x = 1,498.31 × 478.79
  4. Step 4: Simplify right side
    999.55x = 717,372.10
  5. Step 5: Solve for x
    x = 717,372.10/999.55
  6. Step 6: Final answer
    x = 717.70

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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.