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Finding the Fourth Proportional to 753.55, 1,128.81 and 689.30

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Solution

The fourth proportional to 753.55, 1,128.81 and 689.30 is: 1,032.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.55 : 1,128.81 = 689.30 : x
  2. Step 2: Convert to fraction form
    753.55/1,128.81 = 689.30/x
  3. Step 3: Cross multiply
    753.55x = 1,128.81 × 689.30
  4. Step 4: Simplify right side
    753.55x = 778,088.73
  5. Step 5: Solve for x
    x = 778,088.73/753.55
  6. Step 6: Final answer
    x = 1,032.57

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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.