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Finding the Fourth Proportional to 21,156.40, 29,680.40 and 21,156.40

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Solution

The fourth proportional to 21,156.40, 29,680.40 and 21,156.40 is: 29,680.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.40 : 29,680.40 = 21,156.40 : x
  2. Step 2: Convert to fraction form
    21,156.40/29,680.40 = 21,156.40/x
  3. Step 3: Cross multiply
    21,156.40x = 29,680.40 × 21,156.40
  4. Step 4: Simplify right side
    21,156.40x = 627,930,414.56
  5. Step 5: Solve for x
    x = 627,930,414.56/21,156.40
  6. Step 6: Final answer
    x = 29,680.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.