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Finding the Fourth Proportional to 3,287.72, 4,931.38 and 1,988.84

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Solution

The fourth proportional to 3,287.72, 4,931.38 and 1,988.84 is: 2,983.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,287.72 : 4,931.38 = 1,988.84 : x
  2. Step 2: Convert to fraction form
    3,287.72/4,931.38 = 1,988.84/x
  3. Step 3: Cross multiply
    3,287.72x = 4,931.38 × 1,988.84
  4. Step 4: Simplify right side
    3,287.72x = 9,807,725.80
  5. Step 5: Solve for x
    x = 9,807,725.80/3,287.72
  6. Step 6: Final answer
    x = 2,983.14

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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.