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Finding the Fourth Proportional to 21,351.80, 31,986.90 and 11,487.80

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Solution

The fourth proportional to 21,351.80, 31,986.90 and 11,487.80 is: 17,209.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,351.80 : 31,986.90 = 11,487.80 : x
  2. Step 2: Convert to fraction form
    21,351.80/31,986.90 = 11,487.80/x
  3. Step 3: Cross multiply
    21,351.80x = 31,986.90 × 11,487.80
  4. Step 4: Simplify right side
    21,351.80x = 367,459,109.82
  5. Step 5: Solve for x
    x = 367,459,109.82/21,351.80
  6. Step 6: Final answer
    x = 17,209.75

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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.