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Finding the Fourth Proportional to 1,377.12, 2,062.44 and 645.12

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Solution

The fourth proportional to 1,377.12, 2,062.44 and 645.12 is: 966.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.12 : 2,062.44 = 645.12 : x
  2. Step 2: Convert to fraction form
    1,377.12/2,062.44 = 645.12/x
  3. Step 3: Cross multiply
    1,377.12x = 2,062.44 × 645.12
  4. Step 4: Simplify right side
    1,377.12x = 1,330,521.29
  5. Step 5: Solve for x
    x = 1,330,521.29/1,377.12
  6. Step 6: Final answer
    x = 966.16

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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.