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Finding the Fourth Proportional to 15,703.94, 21,672.81 and 8,631.74

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Solution

The fourth proportional to 15,703.94, 21,672.81 and 8,631.74 is: 11,912.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,703.94 : 21,672.81 = 8,631.74 : x
  2. Step 2: Convert to fraction form
    15,703.94/21,672.81 = 8,631.74/x
  3. Step 3: Cross multiply
    15,703.94x = 21,672.81 × 8,631.74
  4. Step 4: Simplify right side
    15,703.94x = 187,073,952.63
  5. Step 5: Solve for x
    x = 187,073,952.63/15,703.94
  6. Step 6: Final answer
    x = 11,912.55

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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.