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Finding the Fourth Proportional to 28,480.82, 42,732.16 and 20,055.40

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Solution

The fourth proportional to 28,480.82, 42,732.16 and 20,055.40 is: 30,090.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,480.82 : 42,732.16 = 20,055.40 : x
  2. Step 2: Convert to fraction form
    28,480.82/42,732.16 = 20,055.40/x
  3. Step 3: Cross multiply
    28,480.82x = 42,732.16 × 20,055.40
  4. Step 4: Simplify right side
    28,480.82x = 857,010,404.70
  5. Step 5: Solve for x
    x = 857,010,404.70/28,480.82
  6. Step 6: Final answer
    x = 30,090.80

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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.