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Finding the Fourth Proportional to 752.67, 1,129.28 and 387.63

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Solution

The fourth proportional to 752.67, 1,129.28 and 387.63 is: 581.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.67 : 1,129.28 = 387.63 : x
  2. Step 2: Convert to fraction form
    752.67/1,129.28 = 387.63/x
  3. Step 3: Cross multiply
    752.67x = 1,129.28 × 387.63
  4. Step 4: Simplify right side
    752.67x = 437,742.81
  5. Step 5: Solve for x
    x = 437,742.81/752.67
  6. Step 6: Final answer
    x = 581.59

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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.