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Finding the Fourth Proportional to 15,012.08, 20,720 and 8,728.08

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Solution

The fourth proportional to 15,012.08, 20,720 and 8,728.08 is: 12,046.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,012.08 : 20,720 = 8,728.08 : x
  2. Step 2: Convert to fraction form
    15,012.08/20,720 = 8,728.08/x
  3. Step 3: Cross multiply
    15,012.08x = 20,720 × 8,728.08
  4. Step 4: Simplify right side
    15,012.08x = 180,845,817.60
  5. Step 5: Solve for x
    x = 180,845,817.60/15,012.08
  6. Step 6: Final answer
    x = 12,046.69

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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.