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Finding the Fourth Proportional to 136,913.80, 205,140.30 and 128,619.40

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Solution

The fourth proportional to 136,913.80, 205,140.30 and 128,619.40 is: 192,712.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,913.80 : 205,140.30 = 128,619.40 : x
  2. Step 2: Convert to fraction form
    136,913.80/205,140.30 = 128,619.40/x
  3. Step 3: Cross multiply
    136,913.80x = 205,140.30 × 128,619.40
  4. Step 4: Simplify right side
    136,913.80x = 26,385,022,301.82
  5. Step 5: Solve for x
    x = 26,385,022,301.82/136,913.80
  6. Step 6: Final answer
    x = 192,712.66

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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.