Home / 15,928.12-21,981-8,855.20

Finding the Fourth Proportional to 15,928.12, 21,981 and 8,855.20

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Solution

The fourth proportional to 15,928.12, 21,981 and 8,855.20 is: 12,220.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,928.12 : 21,981 = 8,855.20 : x
  2. Step 2: Convert to fraction form
    15,928.12/21,981 = 8,855.20/x
  3. Step 3: Cross multiply
    15,928.12x = 21,981 × 8,855.20
  4. Step 4: Simplify right side
    15,928.12x = 194,646,151.20
  5. Step 5: Solve for x
    x = 194,646,151.20/15,928.12
  6. Step 6: Final answer
    x = 12,220.28

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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.