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Finding the Fourth Proportional to 10,866.72, 14,993.40 and 6,390.12

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Solution

The fourth proportional to 10,866.72, 14,993.40 and 6,390.12 is: 8,816.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,866.72 : 14,993.40 = 6,390.12 : x
  2. Step 2: Convert to fraction form
    10,866.72/14,993.40 = 6,390.12/x
  3. Step 3: Cross multiply
    10,866.72x = 14,993.40 × 6,390.12
  4. Step 4: Simplify right side
    10,866.72x = 95,809,625.21
  5. Step 5: Solve for x
    x = 95,809,625.21/10,866.72
  6. Step 6: Final answer
    x = 8,816.79

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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.