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Finding the Fourth Proportional to 14,425.30, 19,905.78 and 8,138.80

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Solution

The fourth proportional to 14,425.30, 19,905.78 and 8,138.80 is: 11,230.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,425.30 : 19,905.78 = 8,138.80 : x
  2. Step 2: Convert to fraction form
    14,425.30/19,905.78 = 8,138.80/x
  3. Step 3: Cross multiply
    14,425.30x = 19,905.78 × 8,138.80
  4. Step 4: Simplify right side
    14,425.30x = 162,009,162.26
  5. Step 5: Solve for x
    x = 162,009,162.26/14,425.30
  6. Step 6: Final answer
    x = 11,230.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.