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Finding the Fourth Proportional to 877.10, 1,209.42 and 717.09

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Solution

The fourth proportional to 877.10, 1,209.42 and 717.09 is: 988.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.10 : 1,209.42 = 717.09 : x
  2. Step 2: Convert to fraction form
    877.10/1,209.42 = 717.09/x
  3. Step 3: Cross multiply
    877.10x = 1,209.42 × 717.09
  4. Step 4: Simplify right side
    877.10x = 867,262.99
  5. Step 5: Solve for x
    x = 867,262.99/877.10
  6. Step 6: Final answer
    x = 988.78

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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.