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Finding the Fourth Proportional to 747.40, 1,120.92 and 260.38

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Solution

The fourth proportional to 747.40, 1,120.92 and 260.38 is: 390.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.40 : 1,120.92 = 260.38 : x
  2. Step 2: Convert to fraction form
    747.40/1,120.92 = 260.38/x
  3. Step 3: Cross multiply
    747.40x = 1,120.92 × 260.38
  4. Step 4: Simplify right side
    747.40x = 291,865.15
  5. Step 5: Solve for x
    x = 291,865.15/747.40
  6. Step 6: Final answer
    x = 390.51

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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.