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Finding the Fourth Proportional to 112,308.61, 154,986.21 and 61,321.78

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Solution

The fourth proportional to 112,308.61, 154,986.21 and 61,321.78 is: 84,624.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    112,308.61 : 154,986.21 = 61,321.78 : x
  2. Step 2: Convert to fraction form
    112,308.61/154,986.21 = 61,321.78/x
  3. Step 3: Cross multiply
    112,308.61x = 154,986.21 × 61,321.78
  4. Step 4: Simplify right side
    112,308.61x = 9,504,030,272.65
  5. Step 5: Solve for x
    x = 9,504,030,272.65/112,308.61
  6. Step 6: Final answer
    x = 84,624.24

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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.