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Finding the Fourth Proportional to 752.19, 1,128.80 and 689.66

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Solution

The fourth proportional to 752.19, 1,128.80 and 689.66 is: 1,034.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    752.19 : 1,128.80 = 689.66 : x
  2. Step 2: Convert to fraction form
    752.19/1,128.80 = 689.66/x
  3. Step 3: Cross multiply
    752.19x = 1,128.80 × 689.66
  4. Step 4: Simplify right side
    752.19x = 778,479.12
  5. Step 5: Solve for x
    x = 778,479.12/752.19
  6. Step 6: Final answer
    x = 1,034.95

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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.