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Finding the Fourth Proportional to 21,591.01, 29,783.73 and 13,815.21

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Solution

The fourth proportional to 21,591.01, 29,783.73 and 13,815.21 is: 19,057.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,591.01 : 29,783.73 = 13,815.21 : x
  2. Step 2: Convert to fraction form
    21,591.01/29,783.73 = 13,815.21/x
  3. Step 3: Cross multiply
    21,591.01x = 29,783.73 × 13,815.21
  4. Step 4: Simplify right side
    21,591.01x = 411,468,484.53
  5. Step 5: Solve for x
    x = 411,468,484.53/21,591.01
  6. Step 6: Final answer
    x = 19,057.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.