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Finding the Fourth Proportional to 139,681.64, 209,529.38 and 39,856.54

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Solution

The fourth proportional to 139,681.64, 209,529.38 and 39,856.54 is: 59,786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,681.64 : 209,529.38 = 39,856.54 : x
  2. Step 2: Convert to fraction form
    139,681.64/209,529.38 = 39,856.54/x
  3. Step 3: Cross multiply
    139,681.64x = 209,529.38 × 39,856.54
  4. Step 4: Simplify right side
    139,681.64x = 8,351,115,515.75
  5. Step 5: Solve for x
    x = 8,351,115,515.75/139,681.64
  6. Step 6: Final answer
    x = 59,786.78

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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.