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Finding the Fourth Proportional to 138,611.88, 191,284.53 and 74,949.66

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Solution

The fourth proportional to 138,611.88, 191,284.53 and 74,949.66 is: 103,430.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,611.88 : 191,284.53 = 74,949.66 : x
  2. Step 2: Convert to fraction form
    138,611.88/191,284.53 = 74,949.66/x
  3. Step 3: Cross multiply
    138,611.88x = 191,284.53 × 74,949.66
  4. Step 4: Simplify right side
    138,611.88x = 14,336,710,486.76
  5. Step 5: Solve for x
    x = 14,336,710,486.76/138,611.88
  6. Step 6: Final answer
    x = 103,430.60

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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.