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Finding the Fourth Proportional to 2,387.22, 3,580.78 and 981.33

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Solution

The fourth proportional to 2,387.22, 3,580.78 and 981.33 is: 1,471.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,387.22 : 3,580.78 = 981.33 : x
  2. Step 2: Convert to fraction form
    2,387.22/3,580.78 = 981.33/x
  3. Step 3: Cross multiply
    2,387.22x = 3,580.78 × 981.33
  4. Step 4: Simplify right side
    2,387.22x = 3,513,926.84
  5. Step 5: Solve for x
    x = 3,513,926.84/2,387.22
  6. Step 6: Final answer
    x = 1,471.97

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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.