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Finding the Fourth Proportional to 1,338.42, 2,006.77 and 644.18

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Solution

The fourth proportional to 1,338.42, 2,006.77 and 644.18 is: 965.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,338.42 : 2,006.77 = 644.18 : x
  2. Step 2: Convert to fraction form
    1,338.42/2,006.77 = 644.18/x
  3. Step 3: Cross multiply
    1,338.42x = 2,006.77 × 644.18
  4. Step 4: Simplify right side
    1,338.42x = 1,292,721.10
  5. Step 5: Solve for x
    x = 1,292,721.10/1,338.42
  6. Step 6: Final answer
    x = 965.86

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1.5x scale

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.