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Finding the Fourth Proportional to 138,615.88, 191,290.05 and 74,953.66

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Solution

The fourth proportional to 138,615.88, 191,290.05 and 74,953.66 is: 103,436.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,615.88 : 191,290.05 = 74,953.66 : x
  2. Step 2: Convert to fraction form
    138,615.88/191,290.05 = 74,953.66/x
  3. Step 3: Cross multiply
    138,615.88x = 191,290.05 × 74,953.66
  4. Step 4: Simplify right side
    138,615.88x = 14,337,889,369.08
  5. Step 5: Solve for x
    x = 14,337,889,369.08/138,615.88
  6. Step 6: Final answer
    x = 103,436.12

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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.