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Finding the Fourth Proportional to 1,377.81, 2,065.10 and 891.14

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Solution

The fourth proportional to 1,377.81, 2,065.10 and 891.14 is: 1,335.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.81 : 2,065.10 = 891.14 : x
  2. Step 2: Convert to fraction form
    1,377.81/2,065.10 = 891.14/x
  3. Step 3: Cross multiply
    1,377.81x = 2,065.10 × 891.14
  4. Step 4: Simplify right side
    1,377.81x = 1,840,278.43
  5. Step 5: Solve for x
    x = 1,840,278.43/1,377.81
  6. Step 6: Final answer
    x = 1,335.65

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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.