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Finding the Fourth Proportional to 1,234.88, 1,705.04 and 987.56

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Solution

The fourth proportional to 1,234.88, 1,705.04 and 987.56 is: 1,363.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,234.88 : 1,705.04 = 987.56 : x
  2. Step 2: Convert to fraction form
    1,234.88/1,705.04 = 987.56/x
  3. Step 3: Cross multiply
    1,234.88x = 1,705.04 × 987.56
  4. Step 4: Simplify right side
    1,234.88x = 1,683,829.30
  5. Step 5: Solve for x
    x = 1,683,829.30/1,234.88
  6. Step 6: Final answer
    x = 1,363.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.