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Finding the Fourth Proportional to 877.97, 1,317.81 and 391.34

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Solution

The fourth proportional to 877.97, 1,317.81 and 391.34 is: 587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.97 : 1,317.81 = 391.34 : x
  2. Step 2: Convert to fraction form
    877.97/1,317.81 = 391.34/x
  3. Step 3: Cross multiply
    877.97x = 1,317.81 × 391.34
  4. Step 4: Simplify right side
    877.97x = 515,711.77
  5. Step 5: Solve for x
    x = 515,711.77/877.97
  6. Step 6: Final answer
    x = 587.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.