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Finding the Fourth Proportional to 15,687.61, 21,639.86 and 9,396.34

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Solution

The fourth proportional to 15,687.61, 21,639.86 and 9,396.34 is: 12,961.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,687.61 : 21,639.86 = 9,396.34 : x
  2. Step 2: Convert to fraction form
    15,687.61/21,639.86 = 9,396.34/x
  3. Step 3: Cross multiply
    15,687.61x = 21,639.86 × 9,396.34
  4. Step 4: Simplify right side
    15,687.61x = 203,335,416.27
  5. Step 5: Solve for x
    x = 203,335,416.27/15,687.61
  6. Step 6: Final answer
    x = 12,961.53

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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.