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Finding the Fourth Proportional to 139,069.54, 191,916.12 and 75,407.50

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Solution

The fourth proportional to 139,069.54, 191,916.12 and 75,407.50 is: 104,062.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,069.54 : 191,916.12 = 75,407.50 : x
  2. Step 2: Convert to fraction form
    139,069.54/191,916.12 = 75,407.50/x
  3. Step 3: Cross multiply
    139,069.54x = 191,916.12 × 75,407.50
  4. Step 4: Simplify right side
    139,069.54x = 14,471,914,818.90
  5. Step 5: Solve for x
    x = 14,471,914,818.90/139,069.54
  6. Step 6: Final answer
    x = 104,062.43

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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.