Home / 8,215.61-11,318.87-7,661.57

Finding the Fourth Proportional to 8,215.61, 11,318.87 and 7,661.57

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Solution

The fourth proportional to 8,215.61, 11,318.87 and 7,661.57 is: 10,555.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,215.61 : 11,318.87 = 7,661.57 : x
  2. Step 2: Convert to fraction form
    8,215.61/11,318.87 = 7,661.57/x
  3. Step 3: Cross multiply
    8,215.61x = 11,318.87 × 7,661.57
  4. Step 4: Simplify right side
    8,215.61x = 86,720,219.92
  5. Step 5: Solve for x
    x = 86,720,219.92/8,215.61
  6. Step 6: Final answer
    x = 10,555.55

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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.