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Finding the Fourth Proportional to 1,222.92, 1,686.60 and 987.66

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Solution

The fourth proportional to 1,222.92, 1,686.60 and 987.66 is: 1,362.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.92 : 1,686.60 = 987.66 : x
  2. Step 2: Convert to fraction form
    1,222.92/1,686.60 = 987.66/x
  3. Step 3: Cross multiply
    1,222.92x = 1,686.60 × 987.66
  4. Step 4: Simplify right side
    1,222.92x = 1,665,787.36
  5. Step 5: Solve for x
    x = 1,665,787.36/1,222.92
  6. Step 6: Final answer
    x = 1,362.14

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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.