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Finding the Fourth Proportional to 12,486.16, 18,740.76 and 8,739.28

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Solution

The fourth proportional to 12,486.16, 18,740.76 and 8,739.28 is: 13,116.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,486.16 : 18,740.76 = 8,739.28 : x
  2. Step 2: Convert to fraction form
    12,486.16/18,740.76 = 8,739.28/x
  3. Step 3: Cross multiply
    12,486.16x = 18,740.76 × 8,739.28
  4. Step 4: Simplify right side
    12,486.16x = 163,780,749.05
  5. Step 5: Solve for x
    x = 163,780,749.05/12,486.16
  6. Step 6: Final answer
    x = 13,116.98

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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.