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Finding the Fourth Proportional to 960.94, 1,439.41 and 891.76

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Solution

The fourth proportional to 960.94, 1,439.41 and 891.76 is: 1,335.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.94 : 1,439.41 = 891.76 : x
  2. Step 2: Convert to fraction form
    960.94/1,439.41 = 891.76/x
  3. Step 3: Cross multiply
    960.94x = 1,439.41 × 891.76
  4. Step 4: Simplify right side
    960.94x = 1,283,596.61
  5. Step 5: Solve for x
    x = 1,283,596.61/960.94
  6. Step 6: Final answer
    x = 1,335.77

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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.