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Finding the Fourth Proportional to 742.65, 1,113.80 and 478.30

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Solution

The fourth proportional to 742.65, 1,113.80 and 478.30 is: 717.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.65 : 1,113.80 = 478.30 : x
  2. Step 2: Convert to fraction form
    742.65/1,113.80 = 478.30/x
  3. Step 3: Cross multiply
    742.65x = 1,113.80 × 478.30
  4. Step 4: Simplify right side
    742.65x = 532,730.54
  5. Step 5: Solve for x
    x = 532,730.54/742.65
  6. Step 6: Final answer
    x = 717.34

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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.