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Finding the Fourth Proportional to 8,439.40, 12,659.34 and 7,477.48

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Solution

The fourth proportional to 8,439.40, 12,659.34 and 7,477.48 is: 11,216.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,439.40 : 12,659.34 = 7,477.48 : x
  2. Step 2: Convert to fraction form
    8,439.40/12,659.34 = 7,477.48/x
  3. Step 3: Cross multiply
    8,439.40x = 12,659.34 × 7,477.48
  4. Step 4: Simplify right side
    8,439.40x = 94,659,961.66
  5. Step 5: Solve for x
    x = 94,659,961.66/8,439.40
  6. Step 6: Final answer
    x = 11,216.43

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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.