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Finding the Fourth Proportional to 111,064.56, 153,286.20 and 87,370.80

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Solution

The fourth proportional to 111,064.56, 153,286.20 and 87,370.80 is: 120,585.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,064.56 : 153,286.20 = 87,370.80 : x
  2. Step 2: Convert to fraction form
    111,064.56/153,286.20 = 87,370.80/x
  3. Step 3: Cross multiply
    111,064.56x = 153,286.20 × 87,370.80
  4. Step 4: Simplify right side
    111,064.56x = 13,392,737,922.96
  5. Step 5: Solve for x
    x = 13,392,737,922.96/111,064.56
  6. Step 6: Final answer
    x = 120,585.16

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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.