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Finding the Fourth Proportional to 818.74, 1,129.82 and 445.71

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Solution

The fourth proportional to 818.74, 1,129.82 and 445.71 is: 615.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.74 : 1,129.82 = 445.71 : x
  2. Step 2: Convert to fraction form
    818.74/1,129.82 = 445.71/x
  3. Step 3: Cross multiply
    818.74x = 1,129.82 × 445.71
  4. Step 4: Simplify right side
    818.74x = 503,572.07
  5. Step 5: Solve for x
    x = 503,572.07/818.74
  6. Step 6: Final answer
    x = 615.06

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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.