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Finding the Fourth Proportional to 820.68, 1,132.57 and 447.68

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Solution

The fourth proportional to 820.68, 1,132.57 and 447.68 is: 617.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.68 : 1,132.57 = 447.68 : x
  2. Step 2: Convert to fraction form
    820.68/1,132.57 = 447.68/x
  3. Step 3: Cross multiply
    820.68x = 1,132.57 × 447.68
  4. Step 4: Simplify right side
    820.68x = 507,029.53
  5. Step 5: Solve for x
    x = 507,029.53/820.68
  6. Step 6: Final answer
    x = 617.81

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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.