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Finding the Fourth Proportional to 28,266.40, 39,019.92 and 21,968.80

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Solution

The fourth proportional to 28,266.40, 39,019.92 and 21,968.80 is: 30,326.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,266.40 : 39,019.92 = 21,968.80 : x
  2. Step 2: Convert to fraction form
    28,266.40/39,019.92 = 21,968.80/x
  3. Step 3: Cross multiply
    28,266.40x = 39,019.92 × 21,968.80
  4. Step 4: Simplify right side
    28,266.40x = 857,220,818.50
  5. Step 5: Solve for x
    x = 857,220,818.50/28,266.40
  6. Step 6: Final answer
    x = 30,326.49

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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.