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Finding the Fourth Proportional to 15,759.90, 21,749.67 and 8,687.10

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Solution

The fourth proportional to 15,759.90, 21,749.67 and 8,687.10 is: 11,988.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,759.90 : 21,749.67 = 8,687.10 : x
  2. Step 2: Convert to fraction form
    15,759.90/21,749.67 = 8,687.10/x
  3. Step 3: Cross multiply
    15,759.90x = 21,749.67 × 8,687.10
  4. Step 4: Simplify right side
    15,759.90x = 188,941,558.26
  5. Step 5: Solve for x
    x = 188,941,558.26/15,759.90
  6. Step 6: Final answer
    x = 11,988.75

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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.