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Finding the Fourth Proportional to 21,991.40, 32,900.70 and 19,917.80

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Solution

The fourth proportional to 21,991.40, 32,900.70 and 19,917.80 is: 29,798.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.40 : 32,900.70 = 19,917.80 : x
  2. Step 2: Convert to fraction form
    21,991.40/32,900.70 = 19,917.80/x
  3. Step 3: Cross multiply
    21,991.40x = 32,900.70 × 19,917.80
  4. Step 4: Simplify right side
    21,991.40x = 655,309,562.46
  5. Step 5: Solve for x
    x = 655,309,562.46/21,991.40
  6. Step 6: Final answer
    x = 29,798.45

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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.