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Finding the Fourth Proportional to 674.42, 1,013.87 and 553.58

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Solution

The fourth proportional to 674.42, 1,013.87 and 553.58 is: 832.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    674.42 : 1,013.87 = 553.58 : x
  2. Step 2: Convert to fraction form
    674.42/1,013.87 = 553.58/x
  3. Step 3: Cross multiply
    674.42x = 1,013.87 × 553.58
  4. Step 4: Simplify right side
    674.42x = 561,258.15
  5. Step 5: Solve for x
    x = 561,258.15/674.42
  6. Step 6: Final answer
    x = 832.21

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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.