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Finding the Fourth Proportional to 810.29, 1,207.31 and 774.90

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Solution

The fourth proportional to 810.29, 1,207.31 and 774.90 is: 1,154.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.29 : 1,207.31 = 774.90 : x
  2. Step 2: Convert to fraction form
    810.29/1,207.31 = 774.90/x
  3. Step 3: Cross multiply
    810.29x = 1,207.31 × 774.90
  4. Step 4: Simplify right side
    810.29x = 935,540.64
  5. Step 5: Solve for x
    x = 935,540.64/810.29
  6. Step 6: Final answer
    x = 1,154.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.