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Finding the Fourth Proportional to 955.40, 1,317.77 and 876.95

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Solution

The fourth proportional to 955.40, 1,317.77 and 876.95 is: 1,209.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.40 : 1,317.77 = 876.95 : x
  2. Step 2: Convert to fraction form
    955.40/1,317.77 = 876.95/x
  3. Step 3: Cross multiply
    955.40x = 1,317.77 × 876.95
  4. Step 4: Simplify right side
    955.40x = 1,155,619.36
  5. Step 5: Solve for x
    x = 1,155,619.36/955.40
  6. Step 6: Final answer
    x = 1,209.57

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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.