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Finding the Fourth Proportional to 139,968.40, 209,889.40 and 40,105.76

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Solution

The fourth proportional to 139,968.40, 209,889.40 and 40,105.76 is: 60,140.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968.40 : 209,889.40 = 40,105.76 : x
  2. Step 2: Convert to fraction form
    139,968.40/209,889.40 = 40,105.76/x
  3. Step 3: Cross multiply
    139,968.40x = 209,889.40 × 40,105.76
  4. Step 4: Simplify right side
    139,968.40x = 8,417,773,902.94
  5. Step 5: Solve for x
    x = 8,417,773,902.94/139,968.40
  6. Step 6: Final answer
    x = 60,140.53

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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.