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Finding the Fourth Proportional to 814.47, 1,123.24 and 639.51

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Solution

The fourth proportional to 814.47, 1,123.24 and 639.51 is: 881.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.47 : 1,123.24 = 639.51 : x
  2. Step 2: Convert to fraction form
    814.47/1,123.24 = 639.51/x
  3. Step 3: Cross multiply
    814.47x = 1,123.24 × 639.51
  4. Step 4: Simplify right side
    814.47x = 718,323.21
  5. Step 5: Solve for x
    x = 718,323.21/814.47
  6. Step 6: Final answer
    x = 881.95

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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.