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Finding the Fourth Proportional to 139,040.40, 208,609.20 and 60,211.20

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Solution

The fourth proportional to 139,040.40, 208,609.20 and 60,211.20 is: 90,337.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,040.40 : 208,609.20 = 60,211.20 : x
  2. Step 2: Convert to fraction form
    139,040.40/208,609.20 = 60,211.20/x
  3. Step 3: Cross multiply
    139,040.40x = 208,609.20 × 60,211.20
  4. Step 4: Simplify right side
    139,040.40x = 12,560,610,263.04
  5. Step 5: Solve for x
    x = 12,560,610,263.04/139,040.40
  6. Step 6: Final answer
    x = 90,337.85

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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.