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Finding the Fourth Proportional to 21,897.40, 32,826.90 and 13,135.80

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Solution

The fourth proportional to 21,897.40, 32,826.90 and 13,135.80 is: 19,692.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,897.40 : 32,826.90 = 13,135.80 : x
  2. Step 2: Convert to fraction form
    21,897.40/32,826.90 = 13,135.80/x
  3. Step 3: Cross multiply
    21,897.40x = 32,826.90 × 13,135.80
  4. Step 4: Simplify right side
    21,897.40x = 431,207,593.02
  5. Step 5: Solve for x
    x = 431,207,593.02/21,897.40
  6. Step 6: Final answer
    x = 19,692.18

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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.