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Finding the Fourth Proportional to 138,590.54, 191,255.41 and 74,928.79

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Solution

The fourth proportional to 138,590.54, 191,255.41 and 74,928.79 is: 103,401.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,590.54 : 191,255.41 = 74,928.79 : x
  2. Step 2: Convert to fraction form
    138,590.54/191,255.41 = 74,928.79/x
  3. Step 3: Cross multiply
    138,590.54x = 191,255.41 × 74,928.79
  4. Step 4: Simplify right side
    138,590.54x = 14,330,536,452.25
  5. Step 5: Solve for x
    x = 14,330,536,452.25/138,590.54
  6. Step 6: Final answer
    x = 103,401.98

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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.