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Finding the Fourth Proportional to 28,405.60, 42,600.30 and 8,679.40

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Solution

The fourth proportional to 28,405.60, 42,600.30 and 8,679.40 is: 13,016.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,405.60 : 42,600.30 = 8,679.40 : x
  2. Step 2: Convert to fraction form
    28,405.60/42,600.30 = 8,679.40/x
  3. Step 3: Cross multiply
    28,405.60x = 42,600.30 × 8,679.40
  4. Step 4: Simplify right side
    28,405.60x = 369,745,043.82
  5. Step 5: Solve for x
    x = 369,745,043.82/28,405.60
  6. Step 6: Final answer
    x = 13,016.63

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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.