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Finding the Fourth Proportional to 820.64, 1,132.72 and 558.81

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Solution

The fourth proportional to 820.64, 1,132.72 and 558.81 is: 771.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.64 : 1,132.72 = 558.81 : x
  2. Step 2: Convert to fraction form
    820.64/1,132.72 = 558.81/x
  3. Step 3: Cross multiply
    820.64x = 1,132.72 × 558.81
  4. Step 4: Simplify right side
    820.64x = 632,972.47
  5. Step 5: Solve for x
    x = 632,972.47/820.64
  6. Step 6: Final answer
    x = 771.32

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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.