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Finding the Fourth Proportional to 139,769.28, 209,686.32 and 39,930.84

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Solution

The fourth proportional to 139,769.28, 209,686.32 and 39,930.84 is: 59,905.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,769.28 : 209,686.32 = 39,930.84 : x
  2. Step 2: Convert to fraction form
    139,769.28/209,686.32 = 39,930.84/x
  3. Step 3: Cross multiply
    139,769.28x = 209,686.32 × 39,930.84
  4. Step 4: Simplify right side
    139,769.28x = 8,372,950,894.11
  5. Step 5: Solve for x
    x = 8,372,950,894.11/139,769.28
  6. Step 6: Final answer
    x = 59,905.52

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1.5x scale

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.