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Finding the Fourth Proportional to 21,991.40, 32,987.10 and 20,868.20

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Solution

The fourth proportional to 21,991.40, 32,987.10 and 20,868.20 is: 31,302.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.40 : 32,987.10 = 20,868.20 : x
  2. Step 2: Convert to fraction form
    21,991.40/32,987.10 = 20,868.20/x
  3. Step 3: Cross multiply
    21,991.40x = 32,987.10 × 20,868.20
  4. Step 4: Simplify right side
    21,991.40x = 688,381,400.22
  5. Step 5: Solve for x
    x = 688,381,400.22/21,991.40
  6. Step 6: Final answer
    x = 31,302.30

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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.