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Finding the Fourth Proportional to 752.89, 1,128.56 and 265.61

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Solution

The fourth proportional to 752.89, 1,128.56 and 265.61 is: 398.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.89 : 1,128.56 = 265.61 : x
  2. Step 2: Convert to fraction form
    752.89/1,128.56 = 265.61/x
  3. Step 3: Cross multiply
    752.89x = 1,128.56 × 265.61
  4. Step 4: Simplify right side
    752.89x = 299,750.51
  5. Step 5: Solve for x
    x = 299,750.51/752.89
  6. Step 6: Final answer
    x = 398.13

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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.