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Finding the Fourth Proportional to 12,486.60, 18,738.72 and 9,208.20

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Solution

The fourth proportional to 12,486.60, 18,738.72 and 9,208.20 is: 13,818.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.60 : 18,738.72 = 9,208.20 : x
  2. Step 2: Convert to fraction form
    12,486.60/18,738.72 = 9,208.20/x
  3. Step 3: Cross multiply
    12,486.60x = 18,738.72 × 9,208.20
  4. Step 4: Simplify right side
    12,486.60x = 172,549,881.50
  5. Step 5: Solve for x
    x = 172,549,881.50/12,486.60
  6. Step 6: Final answer
    x = 13,818.80

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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.