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Finding the Fourth Proportional to 820.77, 1,132.18 and 525.70

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Solution

The fourth proportional to 820.77, 1,132.18 and 525.70 is: 725.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.77 : 1,132.18 = 525.70 : x
  2. Step 2: Convert to fraction form
    820.77/1,132.18 = 525.70/x
  3. Step 3: Cross multiply
    820.77x = 1,132.18 × 525.70
  4. Step 4: Simplify right side
    820.77x = 595,187.03
  5. Step 5: Solve for x
    x = 595,187.03/820.77
  6. Step 6: Final answer
    x = 725.16

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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.