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Finding the Fourth Proportional to 742.90, 1,025.38 and 521.92

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Solution

The fourth proportional to 742.90, 1,025.38 and 521.92 is: 720.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.90 : 1,025.38 = 521.92 : x
  2. Step 2: Convert to fraction form
    742.90/1,025.38 = 521.92/x
  3. Step 3: Cross multiply
    742.90x = 1,025.38 × 521.92
  4. Step 4: Simplify right side
    742.90x = 535,166.85
  5. Step 5: Solve for x
    x = 535,166.85/742.90
  6. Step 6: Final answer
    x = 720.38

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1.5x scale

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.