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Finding the Fourth Proportional to 820.71, 1,132.55 and 471.38

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Solution

The fourth proportional to 820.71, 1,132.55 and 471.38 is: 650.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.71 : 1,132.55 = 471.38 : x
  2. Step 2: Convert to fraction form
    820.71/1,132.55 = 471.38/x
  3. Step 3: Cross multiply
    820.71x = 1,132.55 × 471.38
  4. Step 4: Simplify right side
    820.71x = 533,855.17
  5. Step 5: Solve for x
    x = 533,855.17/820.71
  6. Step 6: Final answer
    x = 650.48

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Double scale
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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.