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Finding the Fourth Proportional to 738.90, 1,108.92 and 392.20

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Solution

The fourth proportional to 738.90, 1,108.92 and 392.20 is: 588.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.90 : 1,108.92 = 392.20 : x
  2. Step 2: Convert to fraction form
    738.90/1,108.92 = 392.20/x
  3. Step 3: Cross multiply
    738.90x = 1,108.92 × 392.20
  4. Step 4: Simplify right side
    738.90x = 434,918.42
  5. Step 5: Solve for x
    x = 434,918.42/738.90
  6. Step 6: Final answer
    x = 588.60

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1.5x scale

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.