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Finding the Fourth Proportional to 136,920.20, 205,401.90 and 43,435.40

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Solution

The fourth proportional to 136,920.20, 205,401.90 and 43,435.40 is: 65,159.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,920.20 : 205,401.90 = 43,435.40 : x
  2. Step 2: Convert to fraction form
    136,920.20/205,401.90 = 43,435.40/x
  3. Step 3: Cross multiply
    136,920.20x = 205,401.90 × 43,435.40
  4. Step 4: Simplify right side
    136,920.20x = 8,921,713,687.26
  5. Step 5: Solve for x
    x = 8,921,713,687.26/136,920.20
  6. Step 6: Final answer
    x = 65,159.95

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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.