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Finding the Fourth Proportional to 2,631.84, 3,947.76 and 988.44

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Solution

The fourth proportional to 2,631.84, 3,947.76 and 988.44 is: 1,482.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.84 : 3,947.76 = 988.44 : x
  2. Step 2: Convert to fraction form
    2,631.84/3,947.76 = 988.44/x
  3. Step 3: Cross multiply
    2,631.84x = 3,947.76 × 988.44
  4. Step 4: Simplify right side
    2,631.84x = 3,902,123.89
  5. Step 5: Solve for x
    x = 3,902,123.89/2,631.84
  6. Step 6: Final answer
    x = 1,482.66

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Similar ratio
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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.