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Finding the Fourth Proportional to 21,991.75, 32,987.63 and 9,679.75

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Solution

The fourth proportional to 21,991.75, 32,987.63 and 9,679.75 is: 14,519.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.75 : 32,987.63 = 9,679.75 : x
  2. Step 2: Convert to fraction form
    21,991.75/32,987.63 = 9,679.75/x
  3. Step 3: Cross multiply
    21,991.75x = 32,987.63 × 9,679.75
  4. Step 4: Simplify right side
    21,991.75x = 319,312,011.49
  5. Step 5: Solve for x
    x = 319,312,011.49/21,991.75
  6. Step 6: Final answer
    x = 14,519.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.