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Finding the Fourth Proportional to 772.21, 1,065.89 and 615.11

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Solution

The fourth proportional to 772.21, 1,065.89 and 615.11 is: 849.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.21 : 1,065.89 = 615.11 : x
  2. Step 2: Convert to fraction form
    772.21/1,065.89 = 615.11/x
  3. Step 3: Cross multiply
    772.21x = 1,065.89 × 615.11
  4. Step 4: Simplify right side
    772.21x = 655,636.52
  5. Step 5: Solve for x
    x = 655,636.52/772.21
  6. Step 6: Final answer
    x = 849.04

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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.