Home / 20,815.30-28,734.49-13,271.75

Finding the Fourth Proportional to 20,815.30, 28,734.49 and 13,271.75

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Solution

The fourth proportional to 20,815.30, 28,734.49 and 13,271.75 is: 18,320.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.30 : 28,734.49 = 13,271.75 : x
  2. Step 2: Convert to fraction form
    20,815.30/28,734.49 = 13,271.75/x
  3. Step 3: Cross multiply
    20,815.30x = 28,734.49 × 13,271.75
  4. Step 4: Simplify right side
    20,815.30x = 381,356,967.66
  5. Step 5: Solve for x
    x = 381,356,967.66/20,815.30
  6. Step 6: Final answer
    x = 18,320.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.