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Finding the Fourth Proportional to 121,787.10, 168,118.02 and 74,055.78

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Solution

The fourth proportional to 121,787.10, 168,118.02 and 74,055.78 is: 102,228.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,787.10 : 168,118.02 = 74,055.78 : x
  2. Step 2: Convert to fraction form
    121,787.10/168,118.02 = 74,055.78/x
  3. Step 3: Cross multiply
    121,787.10x = 168,118.02 × 74,055.78
  4. Step 4: Simplify right side
    121,787.10x = 12,450,111,103.16
  5. Step 5: Solve for x
    x = 12,450,111,103.16/121,787.10
  6. Step 6: Final answer
    x = 102,228.49

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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.