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Finding the Fourth Proportional to 752.47, 1,128.74 and 265.55

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Solution

The fourth proportional to 752.47, 1,128.74 and 265.55 is: 398.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.47 : 1,128.74 = 265.55 : x
  2. Step 2: Convert to fraction form
    752.47/1,128.74 = 265.55/x
  3. Step 3: Cross multiply
    752.47x = 1,128.74 × 265.55
  4. Step 4: Simplify right side
    752.47x = 299,738.40
  5. Step 5: Solve for x
    x = 299,738.40/752.47
  6. Step 6: Final answer
    x = 398.34

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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.