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Finding the Fourth Proportional to 2,631.69, 3,947.67 and 988.47

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Solution

The fourth proportional to 2,631.69, 3,947.67 and 988.47 is: 1,482.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.69 : 3,947.67 = 988.47 : x
  2. Step 2: Convert to fraction form
    2,631.69/3,947.67 = 988.47/x
  3. Step 3: Cross multiply
    2,631.69x = 3,947.67 × 988.47
  4. Step 4: Simplify right side
    2,631.69x = 3,902,153.36
  5. Step 5: Solve for x
    x = 3,902,153.36/2,631.69
  6. Step 6: Final answer
    x = 1,482.76

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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.