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Finding the Fourth Proportional to 128,908.10, 193,362.15 and 69,859.10

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Solution

The fourth proportional to 128,908.10, 193,362.15 and 69,859.10 is: 104,788.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,908.10 : 193,362.15 = 69,859.10 : x
  2. Step 2: Convert to fraction form
    128,908.10/193,362.15 = 69,859.10/x
  3. Step 3: Cross multiply
    128,908.10x = 193,362.15 × 69,859.10
  4. Step 4: Simplify right side
    128,908.10x = 13,508,105,773.07
  5. Step 5: Solve for x
    x = 13,508,105,773.07/128,908.10
  6. Step 6: Final answer
    x = 104,788.65

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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.