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Finding the Fourth Proportional to 676, 1,009.40 and 553.96

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Solution

The fourth proportional to 676, 1,009.40 and 553.96 is: 827.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    676 : 1,009.40 = 553.96 : x
  2. Step 2: Convert to fraction form
    676/1,009.40 = 553.96/x
  3. Step 3: Cross multiply
    676x = 1,009.40 × 553.96
  4. Step 4: Simplify right side
    676x = 559,167.22
  5. Step 5: Solve for x
    x = 559,167.22/676
  6. Step 6: Final answer
    x = 827.17

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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.