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Finding the Fourth Proportional to 138,402.88, 190,995.97 and 74,740.67

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Solution

The fourth proportional to 138,402.88, 190,995.97 and 74,740.67 is: 103,142.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,402.88 : 190,995.97 = 74,740.67 : x
  2. Step 2: Convert to fraction form
    138,402.88/190,995.97 = 74,740.67/x
  3. Step 3: Cross multiply
    138,402.88x = 190,995.97 × 74,740.67
  4. Step 4: Simplify right side
    138,402.88x = 14,275,167,055.74
  5. Step 5: Solve for x
    x = 14,275,167,055.74/138,402.88
  6. Step 6: Final answer
    x = 103,142.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.