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Finding the Fourth Proportional to 689.16, 1,034.46 and 653.88

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Solution

The fourth proportional to 689.16, 1,034.46 and 653.88 is: 981.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    689.16 : 1,034.46 = 653.88 : x
  2. Step 2: Convert to fraction form
    689.16/1,034.46 = 653.88/x
  3. Step 3: Cross multiply
    689.16x = 1,034.46 × 653.88
  4. Step 4: Simplify right side
    689.16x = 676,412.70
  5. Step 5: Solve for x
    x = 676,412.70/689.16
  6. Step 6: Final answer
    x = 981.50

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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.