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Finding the Fourth Proportional to 742.98, 1,025.80 and 477.54

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Solution

The fourth proportional to 742.98, 1,025.80 and 477.54 is: 659.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.98 : 1,025.80 = 477.54 : x
  2. Step 2: Convert to fraction form
    742.98/1,025.80 = 477.54/x
  3. Step 3: Cross multiply
    742.98x = 1,025.80 × 477.54
  4. Step 4: Simplify right side
    742.98x = 489,863.18
  5. Step 5: Solve for x
    x = 489,863.18/742.98
  6. Step 6: Final answer
    x = 659.32

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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.