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Finding the Fourth Proportional to 121,780.32, 168,056.32 and 68,065.36

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Solution

The fourth proportional to 121,780.32, 168,056.32 and 68,065.36 is: 93,929.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,780.32 : 168,056.32 = 68,065.36 : x
  2. Step 2: Convert to fraction form
    121,780.32/168,056.32 = 68,065.36/x
  3. Step 3: Cross multiply
    121,780.32x = 168,056.32 × 68,065.36
  4. Step 4: Simplify right side
    121,780.32x = 11,438,813,921.08
  5. Step 5: Solve for x
    x = 11,438,813,921.08/121,780.32
  6. Step 6: Final answer
    x = 93,929.91

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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.