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Finding the Fourth Proportional to 1,139.80, 1,571.34 and 877.36

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Solution

The fourth proportional to 1,139.80, 1,571.34 and 877.36 is: 1,209.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.80 : 1,571.34 = 877.36 : x
  2. Step 2: Convert to fraction form
    1,139.80/1,571.34 = 877.36/x
  3. Step 3: Cross multiply
    1,139.80x = 1,571.34 × 877.36
  4. Step 4: Simplify right side
    1,139.80x = 1,378,630.86
  5. Step 5: Solve for x
    x = 1,378,630.86/1,139.80
  6. Step 6: Final answer
    x = 1,209.54

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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.