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Finding the Fourth Proportional to 810.72, 1,118.16 and 495.72

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Solution

The fourth proportional to 810.72, 1,118.16 and 495.72 is: 683.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.72 : 1,118.16 = 495.72 : x
  2. Step 2: Convert to fraction form
    810.72/1,118.16 = 495.72/x
  3. Step 3: Cross multiply
    810.72x = 1,118.16 × 495.72
  4. Step 4: Simplify right side
    810.72x = 554,294.28
  5. Step 5: Solve for x
    x = 554,294.28/810.72
  6. Step 6: Final answer
    x = 683.71

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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.