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Finding the Fourth Proportional to 820.26, 1,132.20 and 558.72

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Solution

The fourth proportional to 820.26, 1,132.20 and 558.72 is: 771.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.26 : 1,132.20 = 558.72 : x
  2. Step 2: Convert to fraction form
    820.26/1,132.20 = 558.72/x
  3. Step 3: Cross multiply
    820.26x = 1,132.20 × 558.72
  4. Step 4: Simplify right side
    820.26x = 632,582.78
  5. Step 5: Solve for x
    x = 632,582.78/820.26
  6. Step 6: Final answer
    x = 771.20

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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.