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Finding the Fourth Proportional to 752.31, 1,128.20 and 340.70

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Solution

The fourth proportional to 752.31, 1,128.20 and 340.70 is: 510.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.31 : 1,128.20 = 340.70 : x
  2. Step 2: Convert to fraction form
    752.31/1,128.20 = 340.70/x
  3. Step 3: Cross multiply
    752.31x = 1,128.20 × 340.70
  4. Step 4: Simplify right side
    752.31x = 384,370.40
  5. Step 5: Solve for x
    x = 384,370.40/752.31
  6. Step 6: Final answer
    x = 510.92

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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.