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Finding the Fourth Proportional to 1,134.40, 1,703.20 and 891.20

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Solution

The fourth proportional to 1,134.40, 1,703.20 and 891.20 is: 1,338.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.40 : 1,703.20 = 891.20 : x
  2. Step 2: Convert to fraction form
    1,134.40/1,703.20 = 891.20/x
  3. Step 3: Cross multiply
    1,134.40x = 1,703.20 × 891.20
  4. Step 4: Simplify right side
    1,134.40x = 1,517,891.84
  5. Step 5: Solve for x
    x = 1,517,891.84/1,134.40
  6. Step 6: Final answer
    x = 1,338.06

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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.