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Finding the Fourth Proportional to 138,594.18, 191,248.51 and 78,179.67

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Solution

The fourth proportional to 138,594.18, 191,248.51 and 78,179.67 is: 107,881.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,594.18 : 191,248.51 = 78,179.67 : x
  2. Step 2: Convert to fraction form
    138,594.18/191,248.51 = 78,179.67/x
  3. Step 3: Cross multiply
    138,594.18x = 191,248.51 × 78,179.67
  4. Step 4: Simplify right side
    138,594.18x = 14,951,745,204.34
  5. Step 5: Solve for x
    x = 14,951,745,204.34/138,594.18
  6. Step 6: Final answer
    x = 107,881.48

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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.