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Finding the Fourth Proportional to 15,807.49, 21,814.43 and 8,637.55

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Solution

The fourth proportional to 15,807.49, 21,814.43 and 8,637.55 is: 11,919.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,807.49 : 21,814.43 = 8,637.55 : x
  2. Step 2: Convert to fraction form
    15,807.49/21,814.43 = 8,637.55/x
  3. Step 3: Cross multiply
    15,807.49x = 21,814.43 × 8,637.55
  4. Step 4: Simplify right side
    15,807.49x = 188,423,229.85
  5. Step 5: Solve for x
    x = 188,423,229.85/15,807.49
  6. Step 6: Final answer
    x = 11,919.87

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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.