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Finding the Fourth Proportional to 28,408.60, 42,612.90 and 20,114.20

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Solution

The fourth proportional to 28,408.60, 42,612.90 and 20,114.20 is: 30,171.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,408.60 : 42,612.90 = 20,114.20 : x
  2. Step 2: Convert to fraction form
    28,408.60/42,612.90 = 20,114.20/x
  3. Step 3: Cross multiply
    28,408.60x = 42,612.90 × 20,114.20
  4. Step 4: Simplify right side
    28,408.60x = 857,124,393.18
  5. Step 5: Solve for x
    x = 857,124,393.18/28,408.60
  6. Step 6: Final answer
    x = 30,171.30

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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.