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Finding the Fourth Proportional to 39,367.80, 59,059.80 and 13,091.40

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Solution

The fourth proportional to 39,367.80, 59,059.80 and 13,091.40 is: 19,639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,367.80 : 59,059.80 = 13,091.40 : x
  2. Step 2: Convert to fraction form
    39,367.80/59,059.80 = 13,091.40/x
  3. Step 3: Cross multiply
    39,367.80x = 59,059.80 × 13,091.40
  4. Step 4: Simplify right side
    39,367.80x = 773,175,465.72
  5. Step 5: Solve for x
    x = 773,175,465.72/39,367.80
  6. Step 6: Final answer
    x = 19,639.79

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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.