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Finding the Fourth Proportional to 15,884.84, 21,920.74 and 8,811.20

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Solution

The fourth proportional to 15,884.84, 21,920.74 and 8,811.20 is: 12,159.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.84 : 21,920.74 = 8,811.20 : x
  2. Step 2: Convert to fraction form
    15,884.84/21,920.74 = 8,811.20/x
  3. Step 3: Cross multiply
    15,884.84x = 21,920.74 × 8,811.20
  4. Step 4: Simplify right side
    15,884.84x = 193,147,892.66
  5. Step 5: Solve for x
    x = 193,147,892.66/15,884.84
  6. Step 6: Final answer
    x = 12,159.26

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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.