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Finding the Fourth Proportional to 121,878.72, 168,193.92 and 71,578.56

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Solution

The fourth proportional to 121,878.72, 168,193.92 and 71,578.56 is: 98,779.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,878.72 : 168,193.92 = 71,578.56 : x
  2. Step 2: Convert to fraction form
    121,878.72/168,193.92 = 71,578.56/x
  3. Step 3: Cross multiply
    121,878.72x = 168,193.92 × 71,578.56
  4. Step 4: Simplify right side
    121,878.72x = 12,039,078,594.36
  5. Step 5: Solve for x
    x = 12,039,078,594.36/121,878.72
  6. Step 6: Final answer
    x = 98,779.17

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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.