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Finding the Fourth Proportional to 128,042.98, 191,908.95 and 90,614.06

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Solution

The fourth proportional to 128,042.98, 191,908.95 and 90,614.06 is: 135,811.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,042.98 : 191,908.95 = 90,614.06 : x
  2. Step 2: Convert to fraction form
    128,042.98/191,908.95 = 90,614.06/x
  3. Step 3: Cross multiply
    128,042.98x = 191,908.95 × 90,614.06
  4. Step 4: Simplify right side
    128,042.98x = 17,389,649,109.84
  5. Step 5: Solve for x
    x = 17,389,649,109.84/128,042.98
  6. Step 6: Final answer
    x = 135,811.03

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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.