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Finding the Fourth Proportional to 121,856.80, 168,108.24 and 79,405.60

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Solution

The fourth proportional to 121,856.80, 168,108.24 and 79,405.60 is: 109,544.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,856.80 : 168,108.24 = 79,405.60 : x
  2. Step 2: Convert to fraction form
    121,856.80/168,108.24 = 79,405.60/x
  3. Step 3: Cross multiply
    121,856.80x = 168,108.24 × 79,405.60
  4. Step 4: Simplify right side
    121,856.80x = 13,348,735,662.14
  5. Step 5: Solve for x
    x = 13,348,735,662.14/121,856.80
  6. Step 6: Final answer
    x = 109,544.45

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1.5x scale

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.