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Finding the Fourth Proportional to 15,020.50, 20,728.30 and 8,396.50

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Solution

The fourth proportional to 15,020.50, 20,728.30 and 8,396.50 is: 11,587.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,020.50 : 20,728.30 = 8,396.50 : x
  2. Step 2: Convert to fraction form
    15,020.50/20,728.30 = 8,396.50/x
  3. Step 3: Cross multiply
    15,020.50x = 20,728.30 × 8,396.50
  4. Step 4: Simplify right side
    15,020.50x = 174,045,170.95
  5. Step 5: Solve for x
    x = 174,045,170.95/15,020.50
  6. Step 6: Final answer
    x = 11,587.18

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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.