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Finding the Fourth Proportional to 15,078.99, 20,805.90 and 8,705.48

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Solution

The fourth proportional to 15,078.99, 20,805.90 and 8,705.48 is: 12,011.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,078.99 : 20,805.90 = 8,705.48 : x
  2. Step 2: Convert to fraction form
    15,078.99/20,805.90 = 8,705.48/x
  3. Step 3: Cross multiply
    15,078.99x = 20,805.90 × 8,705.48
  4. Step 4: Simplify right side
    15,078.99x = 181,125,209.66
  5. Step 5: Solve for x
    x = 181,125,209.66/15,078.99
  6. Step 6: Final answer
    x = 12,011.76

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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.