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Finding the Fourth Proportional to 820.71, 1,229.85 and 358.07

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Solution

The fourth proportional to 820.71, 1,229.85 and 358.07 is: 536.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.71 : 1,229.85 = 358.07 : x
  2. Step 2: Convert to fraction form
    820.71/1,229.85 = 358.07/x
  3. Step 3: Cross multiply
    820.71x = 1,229.85 × 358.07
  4. Step 4: Simplify right side
    820.71x = 440,366.24
  5. Step 5: Solve for x
    x = 440,366.24/820.71
  6. Step 6: Final answer
    x = 536.57

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.