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Finding the Fourth Proportional to 13,479.80, 20,219.70 and 5,271.80

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Solution

The fourth proportional to 13,479.80, 20,219.70 and 5,271.80 is: 7,907.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,479.80 : 20,219.70 = 5,271.80 : x
  2. Step 2: Convert to fraction form
    13,479.80/20,219.70 = 5,271.80/x
  3. Step 3: Cross multiply
    13,479.80x = 20,219.70 × 5,271.80
  4. Step 4: Simplify right side
    13,479.80x = 106,594,214.46
  5. Step 5: Solve for x
    x = 106,594,214.46/13,479.80
  6. Step 6: Final answer
    x = 7,907.70

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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.