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Finding the Fourth Proportional to 28,530.80, 42,796.20 and 20,220.20

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Solution

The fourth proportional to 28,530.80, 42,796.20 and 20,220.20 is: 30,330.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,530.80 : 42,796.20 = 20,220.20 : x
  2. Step 2: Convert to fraction form
    28,530.80/42,796.20 = 20,220.20/x
  3. Step 3: Cross multiply
    28,530.80x = 42,796.20 × 20,220.20
  4. Step 4: Simplify right side
    28,530.80x = 865,347,723.24
  5. Step 5: Solve for x
    x = 865,347,723.24/28,530.80
  6. Step 6: Final answer
    x = 30,330.30

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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.