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Finding the Fourth Proportional to 21,710.70, 29,991.45 and 20,103.25

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Solution

The fourth proportional to 21,710.70, 29,991.45 and 20,103.25 is: 27,770.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,710.70 : 29,991.45 = 20,103.25 : x
  2. Step 2: Convert to fraction form
    21,710.70/29,991.45 = 20,103.25/x
  3. Step 3: Cross multiply
    21,710.70x = 29,991.45 × 20,103.25
  4. Step 4: Simplify right side
    21,710.70x = 602,925,617.21
  5. Step 5: Solve for x
    x = 602,925,617.21/21,710.70
  6. Step 6: Final answer
    x = 27,770.90

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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.