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Finding the Fourth Proportional to 15,492.79, 21,380.19 and 8,419.22

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Solution

The fourth proportional to 15,492.79, 21,380.19 and 8,419.22 is: 11,618.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,492.79 : 21,380.19 = 8,419.22 : x
  2. Step 2: Convert to fraction form
    15,492.79/21,380.19 = 8,419.22/x
  3. Step 3: Cross multiply
    15,492.79x = 21,380.19 × 8,419.22
  4. Step 4: Simplify right side
    15,492.79x = 180,004,464.95
  5. Step 5: Solve for x
    x = 180,004,464.95/15,492.79
  6. Step 6: Final answer
    x = 11,618.59

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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.