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Finding the Fourth Proportional to 21,420.60, 32,130.90 and 21,226.20

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Solution

The fourth proportional to 21,420.60, 32,130.90 and 21,226.20 is: 31,839.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.60 : 32,130.90 = 21,226.20 : x
  2. Step 2: Convert to fraction form
    21,420.60/32,130.90 = 21,226.20/x
  3. Step 3: Cross multiply
    21,420.60x = 32,130.90 × 21,226.20
  4. Step 4: Simplify right side
    21,420.60x = 682,016,909.58
  5. Step 5: Solve for x
    x = 682,016,909.58/21,420.60
  6. Step 6: Final answer
    x = 31,839.30

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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.