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Finding the Fourth Proportional to 15,203.12, 20,980.89 and 8,490.44

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Solution

The fourth proportional to 15,203.12, 20,980.89 and 8,490.44 is: 11,717.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,203.12 : 20,980.89 = 8,490.44 : x
  2. Step 2: Convert to fraction form
    15,203.12/20,980.89 = 8,490.44/x
  3. Step 3: Cross multiply
    15,203.12x = 20,980.89 × 8,490.44
  4. Step 4: Simplify right side
    15,203.12x = 178,137,040.14
  5. Step 5: Solve for x
    x = 178,137,040.14/15,203.12
  6. Step 6: Final answer
    x = 11,717.14

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Double scale
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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.