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Finding the Fourth Proportional to 2,631.68, 3,947.44 and 988.48

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Solution

The fourth proportional to 2,631.68, 3,947.44 and 988.48 is: 1,482.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.68 : 3,947.44 = 988.48 : x
  2. Step 2: Convert to fraction form
    2,631.68/3,947.44 = 988.48/x
  3. Step 3: Cross multiply
    2,631.68x = 3,947.44 × 988.48
  4. Step 4: Simplify right side
    2,631.68x = 3,901,965.49
  5. Step 5: Solve for x
    x = 3,901,965.49/2,631.68
  6. Step 6: Final answer
    x = 1,482.69

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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.