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Finding the Fourth Proportional to 121,393.56, 167,550 and 78,878.28

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Solution

The fourth proportional to 121,393.56, 167,550 and 78,878.28 is: 108,869.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,393.56 : 167,550 = 78,878.28 : x
  2. Step 2: Convert to fraction form
    121,393.56/167,550 = 78,878.28/x
  3. Step 3: Cross multiply
    121,393.56x = 167,550 × 78,878.28
  4. Step 4: Simplify right side
    121,393.56x = 13,216,055,814
  5. Step 5: Solve for x
    x = 13,216,055,814/121,393.56
  6. Step 6: Final answer
    x = 108,869.50

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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.