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Finding the Fourth Proportional to 871.35, 1,313.01 and 720.66

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Solution

The fourth proportional to 871.35, 1,313.01 and 720.66 is: 1,085.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.35 : 1,313.01 = 720.66 : x
  2. Step 2: Convert to fraction form
    871.35/1,313.01 = 720.66/x
  3. Step 3: Cross multiply
    871.35x = 1,313.01 × 720.66
  4. Step 4: Simplify right side
    871.35x = 946,233.79
  5. Step 5: Solve for x
    x = 946,233.79/871.35
  6. Step 6: Final answer
    x = 1,085.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.