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Finding the Fourth Proportional to 129,215.80, 193,386.30 and 113,469.40

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Solution

The fourth proportional to 129,215.80, 193,386.30 and 113,469.40 is: 169,820.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,215.80 : 193,386.30 = 113,469.40 : x
  2. Step 2: Convert to fraction form
    129,215.80/193,386.30 = 113,469.40/x
  3. Step 3: Cross multiply
    129,215.80x = 193,386.30 × 113,469.40
  4. Step 4: Simplify right side
    129,215.80x = 21,943,427,429.22
  5. Step 5: Solve for x
    x = 21,943,427,429.22/129,215.80
  6. Step 6: Final answer
    x = 169,820.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.