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Finding the Fourth Proportional to 138,593.18, 191,259.05 and 74,931.44

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Solution

The fourth proportional to 138,593.18, 191,259.05 and 74,931.44 is: 103,405.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,593.18 : 191,259.05 = 74,931.44 : x
  2. Step 2: Convert to fraction form
    138,593.18/191,259.05 = 74,931.44/x
  3. Step 3: Cross multiply
    138,593.18x = 191,259.05 × 74,931.44
  4. Step 4: Simplify right side
    138,593.18x = 14,331,314,698.58
  5. Step 5: Solve for x
    x = 14,331,314,698.58/138,593.18
  6. Step 6: Final answer
    x = 103,405.63

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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.