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Finding the Fourth Proportional to 21,787.80, 32,435.29 and 21,658.20

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Solution

The fourth proportional to 21,787.80, 32,435.29 and 21,658.20 is: 32,242.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,787.80 : 32,435.29 = 21,658.20 : x
  2. Step 2: Convert to fraction form
    21,787.80/32,435.29 = 21,658.20/x
  3. Step 3: Cross multiply
    21,787.80x = 32,435.29 × 21,658.20
  4. Step 4: Simplify right side
    21,787.80x = 702,489,997.88
  5. Step 5: Solve for x
    x = 702,489,997.88/21,787.80
  6. Step 6: Final answer
    x = 32,242.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.