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Finding the Fourth Proportional to 13,138.80, 19,675.80 and 8,732.40

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Solution

The fourth proportional to 13,138.80, 19,675.80 and 8,732.40 is: 13,077.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,138.80 : 19,675.80 = 8,732.40 : x
  2. Step 2: Convert to fraction form
    13,138.80/19,675.80 = 8,732.40/x
  3. Step 3: Cross multiply
    13,138.80x = 19,675.80 × 8,732.40
  4. Step 4: Simplify right side
    13,138.80x = 171,816,955.92
  5. Step 5: Solve for x
    x = 171,816,955.92/13,138.80
  6. Step 6: Final answer
    x = 13,077.07

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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.