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Finding the Fourth Proportional to 28,053.60, 42,080.40 and 18,139.20

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Solution

The fourth proportional to 28,053.60, 42,080.40 and 18,139.20 is: 27,208.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,053.60 : 42,080.40 = 18,139.20 : x
  2. Step 2: Convert to fraction form
    28,053.60/42,080.40 = 18,139.20/x
  3. Step 3: Cross multiply
    28,053.60x = 42,080.40 × 18,139.20
  4. Step 4: Simplify right side
    28,053.60x = 763,304,791.68
  5. Step 5: Solve for x
    x = 763,304,791.68/28,053.60
  6. Step 6: Final answer
    x = 27,208.80

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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.