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Finding the Fourth Proportional to 21,008.40, 31,512.60 and 14,787.60

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Solution

The fourth proportional to 21,008.40, 31,512.60 and 14,787.60 is: 22,181.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.40 : 31,512.60 = 14,787.60 : x
  2. Step 2: Convert to fraction form
    21,008.40/31,512.60 = 14,787.60/x
  3. Step 3: Cross multiply
    21,008.40x = 31,512.60 × 14,787.60
  4. Step 4: Simplify right side
    21,008.40x = 465,995,723.76
  5. Step 5: Solve for x
    x = 465,995,723.76/21,008.40
  6. Step 6: Final answer
    x = 22,181.40

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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.