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Finding the Fourth Proportional to 121,431.12, 167,621.11 and 91,303.93

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Solution

The fourth proportional to 121,431.12, 167,621.11 and 91,303.93 is: 126,034.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,431.12 : 167,621.11 = 91,303.93 : x
  2. Step 2: Convert to fraction form
    121,431.12/167,621.11 = 91,303.93/x
  3. Step 3: Cross multiply
    121,431.12x = 167,621.11 × 91,303.93
  4. Step 4: Simplify right side
    121,431.12x = 15,304,466,093.96
  5. Step 5: Solve for x
    x = 15,304,466,093.96/121,431.12
  6. Step 6: Final answer
    x = 126,034.13

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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.