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Finding the Fourth Proportional to 128,713.72, 193,143.08 and 100,554.76

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Solution

The fourth proportional to 128,713.72, 193,143.08 and 100,554.76 is: 150,888.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,713.72 : 193,143.08 = 100,554.76 : x
  2. Step 2: Convert to fraction form
    128,713.72/193,143.08 = 100,554.76/x
  3. Step 3: Cross multiply
    128,713.72x = 193,143.08 × 100,554.76
  4. Step 4: Simplify right side
    128,713.72x = 19,421,456,055.06
  5. Step 5: Solve for x
    x = 19,421,456,055.06/128,713.72
  6. Step 6: Final answer
    x = 150,888.78

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1.5x scale

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.