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Finding the Fourth Proportional to 13,359.60, 18,408.60 and 9,385.20

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Solution

The fourth proportional to 13,359.60, 18,408.60 and 9,385.20 is: 12,932.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,359.60 : 18,408.60 = 9,385.20 : x
  2. Step 2: Convert to fraction form
    13,359.60/18,408.60 = 9,385.20/x
  3. Step 3: Cross multiply
    13,359.60x = 18,408.60 × 9,385.20
  4. Step 4: Simplify right side
    13,359.60x = 172,768,392.72
  5. Step 5: Solve for x
    x = 172,768,392.72/13,359.60
  6. Step 6: Final answer
    x = 12,932.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.