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Finding the Fourth Proportional to 810.96, 1,118.40 and 727.20

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Solution

The fourth proportional to 810.96, 1,118.40 and 727.20 is: 1,002.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.96 : 1,118.40 = 727.20 : x
  2. Step 2: Convert to fraction form
    810.96/1,118.40 = 727.20/x
  3. Step 3: Cross multiply
    810.96x = 1,118.40 × 727.20
  4. Step 4: Simplify right side
    810.96x = 813,300.48
  5. Step 5: Solve for x
    x = 813,300.48/810.96
  6. Step 6: Final answer
    x = 1,002.89

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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.