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Finding the Fourth Proportional to 121,896.96, 168,180.48 and 79,440

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Solution

The fourth proportional to 121,896.96, 168,180.48 and 79,440 is: 109,602.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,896.96 : 168,180.48 = 79,440 : x
  2. Step 2: Convert to fraction form
    121,896.96/168,180.48 = 79,440/x
  3. Step 3: Cross multiply
    121,896.96x = 168,180.48 × 79,440
  4. Step 4: Simplify right side
    121,896.96x = 13,360,257,331.20
  5. Step 5: Solve for x
    x = 13,360,257,331.20/121,896.96
  6. Step 6: Final answer
    x = 109,602.88

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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.