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Finding the Fourth Proportional to 21,991.70, 32,987.55 and 21,214.10

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Solution

The fourth proportional to 21,991.70, 32,987.55 and 21,214.10 is: 31,821.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.70 : 32,987.55 = 21,214.10 : x
  2. Step 2: Convert to fraction form
    21,991.70/32,987.55 = 21,214.10/x
  3. Step 3: Cross multiply
    21,991.70x = 32,987.55 × 21,214.10
  4. Step 4: Simplify right side
    21,991.70x = 699,801,184.46
  5. Step 5: Solve for x
    x = 699,801,184.46/21,991.70
  6. Step 6: Final answer
    x = 31,821.15

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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.