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Finding the Fourth Proportional to 138,612.88, 191,285.91 and 74,950.66

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Solution

The fourth proportional to 138,612.88, 191,285.91 and 74,950.66 is: 103,431.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,612.88 : 191,285.91 = 74,950.66 : x
  2. Step 2: Convert to fraction form
    138,612.88/191,285.91 = 74,950.66/x
  3. Step 3: Cross multiply
    138,612.88x = 191,285.91 × 74,950.66
  4. Step 4: Simplify right side
    138,612.88x = 14,337,005,203.20
  5. Step 5: Solve for x
    x = 14,337,005,203.20/138,612.88
  6. Step 6: Final answer
    x = 103,431.98

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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.