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Finding the Fourth Proportional to 21,770.40, 32,704.20 and 21,187.20

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Solution

The fourth proportional to 21,770.40, 32,704.20 and 21,187.20 is: 31,828.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,770.40 : 32,704.20 = 21,187.20 : x
  2. Step 2: Convert to fraction form
    21,770.40/32,704.20 = 21,187.20/x
  3. Step 3: Cross multiply
    21,770.40x = 32,704.20 × 21,187.20
  4. Step 4: Simplify right side
    21,770.40x = 692,910,426.24
  5. Step 5: Solve for x
    x = 692,910,426.24/21,770.40
  6. Step 6: Final answer
    x = 31,828.10

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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.