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Finding the Fourth Proportional to 747.47, 1,121.28 and 260.41

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Solution

The fourth proportional to 747.47, 1,121.28 and 260.41 is: 390.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.47 : 1,121.28 = 260.41 : x
  2. Step 2: Convert to fraction form
    747.47/1,121.28 = 260.41/x
  3. Step 3: Cross multiply
    747.47x = 1,121.28 × 260.41
  4. Step 4: Simplify right side
    747.47x = 291,992.52
  5. Step 5: Solve for x
    x = 291,992.52/747.47
  6. Step 6: Final answer
    x = 390.64

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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.