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Finding the Fourth Proportional to 704.98, 1,057.92 and 380.57

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Solution

The fourth proportional to 704.98, 1,057.92 and 380.57 is: 571.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.98 : 1,057.92 = 380.57 : x
  2. Step 2: Convert to fraction form
    704.98/1,057.92 = 380.57/x
  3. Step 3: Cross multiply
    704.98x = 1,057.92 × 380.57
  4. Step 4: Simplify right side
    704.98x = 402,612.61
  5. Step 5: Solve for x
    x = 402,612.61/704.98
  6. Step 6: Final answer
    x = 571.10

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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.