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Finding the Fourth Proportional to 42,408.60, 63,612.90 and 12,847.20

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Solution

The fourth proportional to 42,408.60, 63,612.90 and 12,847.20 is: 19,270.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,408.60 : 63,612.90 = 12,847.20 : x
  2. Step 2: Convert to fraction form
    42,408.60/63,612.90 = 12,847.20/x
  3. Step 3: Cross multiply
    42,408.60x = 63,612.90 × 12,847.20
  4. Step 4: Simplify right side
    42,408.60x = 817,247,648.88
  5. Step 5: Solve for x
    x = 817,247,648.88/42,408.60
  6. Step 6: Final answer
    x = 19,270.80

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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.