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Finding the Fourth Proportional to 814.41, 1,123.56 and 553.14

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Solution

The fourth proportional to 814.41, 1,123.56 and 553.14 is: 763.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.41 : 1,123.56 = 553.14 : x
  2. Step 2: Convert to fraction form
    814.41/1,123.56 = 553.14/x
  3. Step 3: Cross multiply
    814.41x = 1,123.56 × 553.14
  4. Step 4: Simplify right side
    814.41x = 621,485.98
  5. Step 5: Solve for x
    x = 621,485.98/814.41
  6. Step 6: Final answer
    x = 763.11

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.