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Finding the Fourth Proportional to 28,272.60, 42,408.90 and 18,358.20

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Solution

The fourth proportional to 28,272.60, 42,408.90 and 18,358.20 is: 27,537.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,272.60 : 42,408.90 = 18,358.20 : x
  2. Step 2: Convert to fraction form
    28,272.60/42,408.90 = 18,358.20/x
  3. Step 3: Cross multiply
    28,272.60x = 42,408.90 × 18,358.20
  4. Step 4: Simplify right side
    28,272.60x = 778,551,067.98
  5. Step 5: Solve for x
    x = 778,551,067.98/28,272.60
  6. Step 6: Final answer
    x = 27,537.30

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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.