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Finding the Fourth Proportional to 1,377.44, 2,064.40 and 645.40

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Solution

The fourth proportional to 1,377.44, 2,064.40 and 645.40 is: 967.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.44 : 2,064.40 = 645.40 : x
  2. Step 2: Convert to fraction form
    1,377.44/2,064.40 = 645.40/x
  3. Step 3: Cross multiply
    1,377.44x = 2,064.40 × 645.40
  4. Step 4: Simplify right side
    1,377.44x = 1,332,355.37
  5. Step 5: Solve for x
    x = 1,332,355.37/1,377.44
  6. Step 6: Final answer
    x = 967.27

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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.