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Finding the Fourth Proportional to 818.95, 1,130.11 and 445.91

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Solution

The fourth proportional to 818.95, 1,130.11 and 445.91 is: 615.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    818.95 : 1,130.11 = 445.91 : x
  2. Step 2: Convert to fraction form
    818.95/1,130.11 = 445.91/x
  3. Step 3: Cross multiply
    818.95x = 1,130.11 × 445.91
  4. Step 4: Simplify right side
    818.95x = 503,928.49
  5. Step 5: Solve for x
    x = 503,928.49/818.95
  6. Step 6: Final answer
    x = 615.33

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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.