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Finding the Fourth Proportional to 12,665.80, 18,998.70 and 5,645.80

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Solution

The fourth proportional to 12,665.80, 18,998.70 and 5,645.80 is: 8,468.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,665.80 : 18,998.70 = 5,645.80 : x
  2. Step 2: Convert to fraction form
    12,665.80/18,998.70 = 5,645.80/x
  3. Step 3: Cross multiply
    12,665.80x = 18,998.70 × 5,645.80
  4. Step 4: Simplify right side
    12,665.80x = 107,262,860.46
  5. Step 5: Solve for x
    x = 107,262,860.46/12,665.80
  6. Step 6: Final answer
    x = 8,468.70

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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.