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Finding the Fourth Proportional to 1,642.68, 2,267.10 and 979.53

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Solution

The fourth proportional to 1,642.68, 2,267.10 and 979.53 is: 1,351.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.68 : 2,267.10 = 979.53 : x
  2. Step 2: Convert to fraction form
    1,642.68/2,267.10 = 979.53/x
  3. Step 3: Cross multiply
    1,642.68x = 2,267.10 × 979.53
  4. Step 4: Simplify right side
    1,642.68x = 2,220,692.46
  5. Step 5: Solve for x
    x = 2,220,692.46/1,642.68
  6. Step 6: Final answer
    x = 1,351.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.