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Finding the Fourth Proportional to 8,965.62, 12,369.51 and 5,187.78

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Solution

The fourth proportional to 8,965.62, 12,369.51 and 5,187.78 is: 7,157.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,965.62 : 12,369.51 = 5,187.78 : x
  2. Step 2: Convert to fraction form
    8,965.62/12,369.51 = 5,187.78/x
  3. Step 3: Cross multiply
    8,965.62x = 12,369.51 × 5,187.78
  4. Step 4: Simplify right side
    8,965.62x = 64,170,296.59
  5. Step 5: Solve for x
    x = 64,170,296.59/8,965.62
  6. Step 6: Final answer
    x = 7,157.37

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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.