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Finding the Fourth Proportional to 138,203.79, 190,625.79 and 84,515.22

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Solution

The fourth proportional to 138,203.79, 190,625.79 and 84,515.22 is: 116,572.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,203.79 : 190,625.79 = 84,515.22 : x
  2. Step 2: Convert to fraction form
    138,203.79/190,625.79 = 84,515.22/x
  3. Step 3: Cross multiply
    138,203.79x = 190,625.79 × 84,515.22
  4. Step 4: Simplify right side
    138,203.79x = 16,110,780,579.52
  5. Step 5: Solve for x
    x = 16,110,780,579.52/138,203.79
  6. Step 6: Final answer
    x = 116,572.64

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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.