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Finding the Fourth Proportional to 810.89, 1,118.75 and 495.97

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Solution

The fourth proportional to 810.89, 1,118.75 and 495.97 is: 684.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.89 : 1,118.75 = 495.97 : x
  2. Step 2: Convert to fraction form
    810.89/1,118.75 = 495.97/x
  3. Step 3: Cross multiply
    810.89x = 1,118.75 × 495.97
  4. Step 4: Simplify right side
    810.89x = 554,869.55
  5. Step 5: Solve for x
    x = 554,869.55/810.89
  6. Step 6: Final answer
    x = 684.28

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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.