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Finding the Fourth Proportional to 810.79, 1,118.13 and 531.27

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Solution

The fourth proportional to 810.79, 1,118.13 and 531.27 is: 732.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.79 : 1,118.13 = 531.27 : x
  2. Step 2: Convert to fraction form
    810.79/1,118.13 = 531.27/x
  3. Step 3: Cross multiply
    810.79x = 1,118.13 × 531.27
  4. Step 4: Simplify right side
    810.79x = 594,025.28
  5. Step 5: Solve for x
    x = 594,025.28/810.79
  6. Step 6: Final answer
    x = 732.65

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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.