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Finding the Fourth Proportional to 127,940.72, 191,916.84 and 39,187.76

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Solution

The fourth proportional to 127,940.72, 191,916.84 and 39,187.76 is: 58,783.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    127,940.72 : 191,916.84 = 39,187.76 : x
  2. Step 2: Convert to fraction form
    127,940.72/191,916.84 = 39,187.76/x
  3. Step 3: Cross multiply
    127,940.72x = 191,916.84 × 39,187.76
  4. Step 4: Simplify right side
    127,940.72x = 7,520,791,065.88
  5. Step 5: Solve for x
    x = 7,520,791,065.88/127,940.72
  6. Step 6: Final answer
    x = 58,783.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.