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Finding the Fourth Proportional to 753.00, 1,128.33 and 642.74

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Solution

The fourth proportional to 753.00, 1,128.33 and 642.74 is: 963.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.00 : 1,128.33 = 642.74 : x
  2. Step 2: Convert to fraction form
    753.00/1,128.33 = 642.74/x
  3. Step 3: Cross multiply
    753.00x = 1,128.33 × 642.74
  4. Step 4: Simplify right side
    753.00x = 725,217.18
  5. Step 5: Solve for x
    x = 725,217.18/753.00
  6. Step 6: Final answer
    x = 963.11

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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.