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Finding the Fourth Proportional to 21,844.40, 32,815.20 and 21,261.20

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Solution

The fourth proportional to 21,844.40, 32,815.20 and 21,261.20 is: 31,939.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,844.40 : 32,815.20 = 21,261.20 : x
  2. Step 2: Convert to fraction form
    21,844.40/32,815.20 = 21,261.20/x
  3. Step 3: Cross multiply
    21,844.40x = 32,815.20 × 21,261.20
  4. Step 4: Simplify right side
    21,844.40x = 697,690,530.24
  5. Step 5: Solve for x
    x = 697,690,530.24/21,844.40
  6. Step 6: Final answer
    x = 31,939.10

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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.