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Finding the Fourth Proportional to 15,679.85, 21,638.15 and 8,606.12

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Solution

The fourth proportional to 15,679.85, 21,638.15 and 8,606.12 is: 11,876.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,679.85 : 21,638.15 = 8,606.12 : x
  2. Step 2: Convert to fraction form
    15,679.85/21,638.15 = 8,606.12/x
  3. Step 3: Cross multiply
    15,679.85x = 21,638.15 × 8,606.12
  4. Step 4: Simplify right side
    15,679.85x = 186,220,444.94
  5. Step 5: Solve for x
    x = 186,220,444.94/15,679.85
  6. Step 6: Final answer
    x = 11,876.42

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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.