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Finding the Fourth Proportional to 121,779.57, 168,052.71 and 68,065.05

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Solution

The fourth proportional to 121,779.57, 168,052.71 and 68,065.05 is: 93,928.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,779.57 : 168,052.71 = 68,065.05 : x
  2. Step 2: Convert to fraction form
    121,779.57/168,052.71 = 68,065.05/x
  3. Step 3: Cross multiply
    121,779.57x = 168,052.71 × 68,065.05
  4. Step 4: Simplify right side
    121,779.57x = 11,438,516,108.79
  5. Step 5: Solve for x
    x = 11,438,516,108.79/121,779.57
  6. Step 6: Final answer
    x = 93,928.04

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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.