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Finding the Fourth Proportional to 21,907.20, 32,860.80 and 13,612.80

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Solution

The fourth proportional to 21,907.20, 32,860.80 and 13,612.80 is: 20,419.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,907.20 : 32,860.80 = 13,612.80 : x
  2. Step 2: Convert to fraction form
    21,907.20/32,860.80 = 13,612.80/x
  3. Step 3: Cross multiply
    21,907.20x = 32,860.80 × 13,612.80
  4. Step 4: Simplify right side
    21,907.20x = 447,327,498.24
  5. Step 5: Solve for x
    x = 447,327,498.24/21,907.20
  6. Step 6: Final answer
    x = 20,419.20

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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.