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Finding the Fourth Proportional to 28,954.60, 39,903.78 and 21,869.80

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Solution

The fourth proportional to 28,954.60, 39,903.78 and 21,869.80 is: 30,139.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,954.60 : 39,903.78 = 21,869.80 : x
  2. Step 2: Convert to fraction form
    28,954.60/39,903.78 = 21,869.80/x
  3. Step 3: Cross multiply
    28,954.60x = 39,903.78 × 21,869.80
  4. Step 4: Simplify right side
    28,954.60x = 872,687,687.84
  5. Step 5: Solve for x
    x = 872,687,687.84/28,954.60
  6. Step 6: Final answer
    x = 30,139.86

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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.