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Finding the Fourth Proportional to 820.32, 1,132.57 and 521.64

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Solution

The fourth proportional to 820.32, 1,132.57 and 521.64 is: 720.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.32 : 1,132.57 = 521.64 : x
  2. Step 2: Convert to fraction form
    820.32/1,132.57 = 521.64/x
  3. Step 3: Cross multiply
    820.32x = 1,132.57 × 521.64
  4. Step 4: Simplify right side
    820.32x = 590,785.54
  5. Step 5: Solve for x
    x = 590,785.54/820.32
  6. Step 6: Final answer
    x = 720.19

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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.