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Finding the Fourth Proportional to 821.14, 1,132.68 and 506.56

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Solution

The fourth proportional to 821.14, 1,132.68 and 506.56 is: 698.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.14 : 1,132.68 = 506.56 : x
  2. Step 2: Convert to fraction form
    821.14/1,132.68 = 506.56/x
  3. Step 3: Cross multiply
    821.14x = 1,132.68 × 506.56
  4. Step 4: Simplify right side
    821.14x = 573,770.38
  5. Step 5: Solve for x
    x = 573,770.38/821.14
  6. Step 6: Final answer
    x = 698.75

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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.