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Finding the Fourth Proportional to 121,409.56, 167,572.08 and 78,894.28

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Solution

The fourth proportional to 121,409.56, 167,572.08 and 78,894.28 is: 108,891.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,409.56 : 167,572.08 = 78,894.28 : x
  2. Step 2: Convert to fraction form
    121,409.56/167,572.08 = 78,894.28/x
  3. Step 3: Cross multiply
    121,409.56x = 167,572.08 × 78,894.28
  4. Step 4: Simplify right side
    121,409.56x = 13,220,478,599.70
  5. Step 5: Solve for x
    x = 13,220,478,599.70/121,409.56
  6. Step 6: Final answer
    x = 108,891.58

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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.