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Finding the Fourth Proportional to 960.90, 1,439.52 and 807.84

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Solution

The fourth proportional to 960.90, 1,439.52 and 807.84 is: 1,210.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    960.90 : 1,439.52 = 807.84 : x
  2. Step 2: Convert to fraction form
    960.90/1,439.52 = 807.84/x
  3. Step 3: Cross multiply
    960.90x = 1,439.52 × 807.84
  4. Step 4: Simplify right side
    960.90x = 1,162,901.84
  5. Step 5: Solve for x
    x = 1,162,901.84/960.90
  6. Step 6: Final answer
    x = 1,210.22

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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.