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Finding the Fourth Proportional to 21,881.40, 32,822.10 and 20,860.80

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Solution

The fourth proportional to 21,881.40, 32,822.10 and 20,860.80 is: 31,291.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,881.40 : 32,822.10 = 20,860.80 : x
  2. Step 2: Convert to fraction form
    21,881.40/32,822.10 = 20,860.80/x
  3. Step 3: Cross multiply
    21,881.40x = 32,822.10 × 20,860.80
  4. Step 4: Simplify right side
    21,881.40x = 684,695,263.68
  5. Step 5: Solve for x
    x = 684,695,263.68/21,881.40
  6. Step 6: Final answer
    x = 31,291.20

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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.