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Finding the Fourth Proportional to 820.97, 1,229.52 and 430.04

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Solution

The fourth proportional to 820.97, 1,229.52 and 430.04 is: 644.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.97 : 1,229.52 = 430.04 : x
  2. Step 2: Convert to fraction form
    820.97/1,229.52 = 430.04/x
  3. Step 3: Cross multiply
    820.97x = 1,229.52 × 430.04
  4. Step 4: Simplify right side
    820.97x = 528,742.78
  5. Step 5: Solve for x
    x = 528,742.78/820.97
  6. Step 6: Final answer
    x = 644.05

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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.