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Finding the Fourth Proportional to 21,326.70, 31,990.05 and 20,174.70

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Solution

The fourth proportional to 21,326.70, 31,990.05 and 20,174.70 is: 30,262.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,326.70 : 31,990.05 = 20,174.70 : x
  2. Step 2: Convert to fraction form
    21,326.70/31,990.05 = 20,174.70/x
  3. Step 3: Cross multiply
    21,326.70x = 31,990.05 × 20,174.70
  4. Step 4: Simplify right side
    21,326.70x = 645,389,661.74
  5. Step 5: Solve for x
    x = 645,389,661.74/21,326.70
  6. Step 6: Final answer
    x = 30,262.05

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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.