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Finding the Fourth Proportional to 1,221.15, 1,685.08 and 723.71

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Solution

The fourth proportional to 1,221.15, 1,685.08 and 723.71 is: 998.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.15 : 1,685.08 = 723.71 : x
  2. Step 2: Convert to fraction form
    1,221.15/1,685.08 = 723.71/x
  3. Step 3: Cross multiply
    1,221.15x = 1,685.08 × 723.71
  4. Step 4: Simplify right side
    1,221.15x = 1,219,500.81
  5. Step 5: Solve for x
    x = 1,219,500.81/1,221.15
  6. Step 6: Final answer
    x = 998.65

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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.