Home / 15,885.12-21,920.85-8,811.42

Finding the Fourth Proportional to 15,885.12, 21,920.85 and 8,811.42

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Solution

The fourth proportional to 15,885.12, 21,920.85 and 8,811.42 is: 12,159.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.12 : 21,920.85 = 8,811.42 : x
  2. Step 2: Convert to fraction form
    15,885.12/21,920.85 = 8,811.42/x
  3. Step 3: Cross multiply
    15,885.12x = 21,920.85 × 8,811.42
  4. Step 4: Simplify right side
    15,885.12x = 193,153,816.11
  5. Step 5: Solve for x
    x = 193,153,816.11/15,885.12
  6. Step 6: Final answer
    x = 12,159.42

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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.