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Finding the Fourth Proportional to 15,778.13, 21,773.84 and 8,705.03

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Solution

The fourth proportional to 15,778.13, 21,773.84 and 8,705.03 is: 12,012.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,778.13 : 21,773.84 = 8,705.03 : x
  2. Step 2: Convert to fraction form
    15,778.13/21,773.84 = 8,705.03/x
  3. Step 3: Cross multiply
    15,778.13x = 21,773.84 × 8,705.03
  4. Step 4: Simplify right side
    15,778.13x = 189,541,778.02
  5. Step 5: Solve for x
    x = 189,541,778.02/15,778.13
  6. Step 6: Final answer
    x = 12,012.95

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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.