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Finding the Fourth Proportional to 121,115.70, 167,186.16 and 90,988.41

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Solution

The fourth proportional to 121,115.70, 167,186.16 and 90,988.41 is: 125,598.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,115.70 : 167,186.16 = 90,988.41 : x
  2. Step 2: Convert to fraction form
    121,115.70/167,186.16 = 90,988.41/x
  3. Step 3: Cross multiply
    121,115.70x = 167,186.16 × 90,988.41
  4. Step 4: Simplify right side
    121,115.70x = 15,212,002,872.41
  5. Step 5: Solve for x
    x = 15,212,002,872.41/121,115.70
  6. Step 6: Final answer
    x = 125,598.93

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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.