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Finding the Fourth Proportional to 747.40, 1,120.90 and 260.40

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Solution

The fourth proportional to 747.40, 1,120.90 and 260.40 is: 390.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.40 : 1,120.90 = 260.40 : x
  2. Step 2: Convert to fraction form
    747.40/1,120.90 = 260.40/x
  3. Step 3: Cross multiply
    747.40x = 1,120.90 × 260.40
  4. Step 4: Simplify right side
    747.40x = 291,882.36
  5. Step 5: Solve for x
    x = 291,882.36/747.40
  6. Step 6: Final answer
    x = 390.53

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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.