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Finding the Fourth Proportional to 138,919.20, 208,354.52 and 39,055.67

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Solution

The fourth proportional to 138,919.20, 208,354.52 and 39,055.67 is: 58,576.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,919.20 : 208,354.52 = 39,055.67 : x
  2. Step 2: Convert to fraction form
    138,919.20/208,354.52 = 39,055.67/x
  3. Step 3: Cross multiply
    138,919.20x = 208,354.52 × 39,055.67
  4. Step 4: Simplify right side
    138,919.20x = 8,137,425,376.13
  5. Step 5: Solve for x
    x = 8,137,425,376.13/138,919.20
  6. Step 6: Final answer
    x = 58,576.68

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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.