Home / 12,811.53-17,678.15-7,145.62

Finding the Fourth Proportional to 12,811.53, 17,678.15 and 7,145.62

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Solution

The fourth proportional to 12,811.53, 17,678.15 and 7,145.62 is: 9,859.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.53 : 17,678.15 = 7,145.62 : x
  2. Step 2: Convert to fraction form
    12,811.53/17,678.15 = 7,145.62/x
  3. Step 3: Cross multiply
    12,811.53x = 17,678.15 × 7,145.62
  4. Step 4: Simplify right side
    12,811.53x = 126,321,289.08
  5. Step 5: Solve for x
    x = 126,321,289.08/12,811.53
  6. Step 6: Final answer
    x = 9,859.97

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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.