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Finding the Fourth Proportional to 1,219.69, 1,829.43 and 987.31

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Solution

The fourth proportional to 1,219.69, 1,829.43 and 987.31 is: 1,480.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,219.69 : 1,829.43 = 987.31 : x
  2. Step 2: Convert to fraction form
    1,219.69/1,829.43 = 987.31/x
  3. Step 3: Cross multiply
    1,219.69x = 1,829.43 × 987.31
  4. Step 4: Simplify right side
    1,219.69x = 1,806,214.53
  5. Step 5: Solve for x
    x = 1,806,214.53/1,219.69
  6. Step 6: Final answer
    x = 1,480.88

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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.