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Finding the Fourth Proportional to 139,218.90, 208,836.78 and 39,386.67

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Solution

The fourth proportional to 139,218.90, 208,836.78 and 39,386.67 is: 59,082.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,218.90 : 208,836.78 = 39,386.67 : x
  2. Step 2: Convert to fraction form
    139,218.90/208,836.78 = 39,386.67/x
  3. Step 3: Cross multiply
    139,218.90x = 208,836.78 × 39,386.67
  4. Step 4: Simplify right side
    139,218.90x = 8,225,385,337.72
  5. Step 5: Solve for x
    x = 8,225,385,337.72/139,218.90
  6. Step 6: Final answer
    x = 59,082.39

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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.