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Finding the Fourth Proportional to 12,345.40, 18,518.10 and 8,408.80

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Solution

The fourth proportional to 12,345.40, 18,518.10 and 8,408.80 is: 12,613.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,345.40 : 18,518.10 = 8,408.80 : x
  2. Step 2: Convert to fraction form
    12,345.40/18,518.10 = 8,408.80/x
  3. Step 3: Cross multiply
    12,345.40x = 18,518.10 × 8,408.80
  4. Step 4: Simplify right side
    12,345.40x = 155,714,999.28
  5. Step 5: Solve for x
    x = 155,714,999.28/12,345.40
  6. Step 6: Final answer
    x = 12,613.20

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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.