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Finding the Fourth Proportional to 138,719, 191,411.68 and 84,242.83

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Solution

The fourth proportional to 138,719, 191,411.68 and 84,242.83 is: 116,242.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,719 : 191,411.68 = 84,242.83 : x
  2. Step 2: Convert to fraction form
    138,719/191,411.68 = 84,242.83/x
  3. Step 3: Cross multiply
    138,719x = 191,411.68 × 84,242.83
  4. Step 4: Simplify right side
    138,719x = 16,125,061,618.25
  5. Step 5: Solve for x
    x = 16,125,061,618.25/138,719
  6. Step 6: Final answer
    x = 116,242.63

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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.