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Finding the Fourth Proportional to 15,207.21, 20,985.74 and 8,492.95

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Solution

The fourth proportional to 15,207.21, 20,985.74 and 8,492.95 is: 11,720.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,207.21 : 20,985.74 = 8,492.95 : x
  2. Step 2: Convert to fraction form
    15,207.21/20,985.74 = 8,492.95/x
  3. Step 3: Cross multiply
    15,207.21x = 20,985.74 × 8,492.95
  4. Step 4: Simplify right side
    15,207.21x = 178,230,882.38
  5. Step 5: Solve for x
    x = 178,230,882.38/15,207.21
  6. Step 6: Final answer
    x = 11,720.16

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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.