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Finding the Fourth Proportional to 12,650.81, 18,987.78 and 6,415.12

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Solution

The fourth proportional to 12,650.81, 18,987.78 and 6,415.12 is: 9,628.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,650.81 : 18,987.78 = 6,415.12 : x
  2. Step 2: Convert to fraction form
    12,650.81/18,987.78 = 6,415.12/x
  3. Step 3: Cross multiply
    12,650.81x = 18,987.78 × 6,415.12
  4. Step 4: Simplify right side
    12,650.81x = 121,808,988.43
  5. Step 5: Solve for x
    x = 121,808,988.43/12,650.81
  6. Step 6: Final answer
    x = 9,628.55

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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.