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Finding the Fourth Proportional to 15,767.63, 21,758.21 and 8,693.90

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Solution

The fourth proportional to 15,767.63, 21,758.21 and 8,693.90 is: 11,996.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,767.63 : 21,758.21 = 8,693.90 : x
  2. Step 2: Convert to fraction form
    15,767.63/21,758.21 = 8,693.90/x
  3. Step 3: Cross multiply
    15,767.63x = 21,758.21 × 8,693.90
  4. Step 4: Simplify right side
    15,767.63x = 189,163,593.13
  5. Step 5: Solve for x
    x = 189,163,593.13/15,767.63
  6. Step 6: Final answer
    x = 11,996.96

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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.