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Finding the Fourth Proportional to 820.61, 1,132.43 and 447.60

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Solution

The fourth proportional to 820.61, 1,132.43 and 447.60 is: 617.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.61 : 1,132.43 = 447.60 : x
  2. Step 2: Convert to fraction form
    820.61/1,132.43 = 447.60/x
  3. Step 3: Cross multiply
    820.61x = 1,132.43 × 447.60
  4. Step 4: Simplify right side
    820.61x = 506,867.77
  5. Step 5: Solve for x
    x = 506,867.77/820.61
  6. Step 6: Final answer
    x = 617.67

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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.