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Finding the Fourth Proportional to 689.16, 1,028.68 and 631.44

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Solution

The fourth proportional to 689.16, 1,028.68 and 631.44 is: 942.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.16 : 1,028.68 = 631.44 : x
  2. Step 2: Convert to fraction form
    689.16/1,028.68 = 631.44/x
  3. Step 3: Cross multiply
    689.16x = 1,028.68 × 631.44
  4. Step 4: Simplify right side
    689.16x = 649,549.70
  5. Step 5: Solve for x
    x = 649,549.70/689.16
  6. Step 6: Final answer
    x = 942.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.