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Finding the Fourth Proportional to 818.75, 1,129.86 and 445.74

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Solution

The fourth proportional to 818.75, 1,129.86 and 445.74 is: 615.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.75 : 1,129.86 = 445.74 : x
  2. Step 2: Convert to fraction form
    818.75/1,129.86 = 445.74/x
  3. Step 3: Cross multiply
    818.75x = 1,129.86 × 445.74
  4. Step 4: Simplify right side
    818.75x = 503,618.15
  5. Step 5: Solve for x
    x = 503,618.15/818.75
  6. Step 6: Final answer
    x = 615.11

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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.