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Finding the Fourth Proportional to 136,695.20, 205,042.80 and 103,015.40

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Solution

The fourth proportional to 136,695.20, 205,042.80 and 103,015.40 is: 154,523.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,695.20 : 205,042.80 = 103,015.40 : x
  2. Step 2: Convert to fraction form
    136,695.20/205,042.80 = 103,015.40/x
  3. Step 3: Cross multiply
    136,695.20x = 205,042.80 × 103,015.40
  4. Step 4: Simplify right side
    136,695.20x = 21,122,566,059.12
  5. Step 5: Solve for x
    x = 21,122,566,059.12/136,695.20
  6. Step 6: Final answer
    x = 154,523.10

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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.