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Finding the Fourth Proportional to 15,717.89, 21,690.09 and 8,643.89

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Solution

The fourth proportional to 15,717.89, 21,690.09 and 8,643.89 is: 11,928.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,717.89 : 21,690.09 = 8,643.89 : x
  2. Step 2: Convert to fraction form
    15,717.89/21,690.09 = 8,643.89/x
  3. Step 3: Cross multiply
    15,717.89x = 21,690.09 × 8,643.89
  4. Step 4: Simplify right side
    15,717.89x = 187,486,708.83
  5. Step 5: Solve for x
    x = 187,486,708.83/15,717.89
  6. Step 6: Final answer
    x = 11,928.24

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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.