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Finding the Fourth Proportional to 881.96, 1,216.09 and 715.66

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Solution

The fourth proportional to 881.96, 1,216.09 and 715.66 is: 986.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.96 : 1,216.09 = 715.66 : x
  2. Step 2: Convert to fraction form
    881.96/1,216.09 = 715.66/x
  3. Step 3: Cross multiply
    881.96x = 1,216.09 × 715.66
  4. Step 4: Simplify right side
    881.96x = 870,306.97
  5. Step 5: Solve for x
    x = 870,306.97/881.96
  6. Step 6: Final answer
    x = 986.79

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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.