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Finding the Fourth Proportional to 723.68, 1,085.66 and 338.94

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Solution

The fourth proportional to 723.68, 1,085.66 and 338.94 is: 508.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.68 : 1,085.66 = 338.94 : x
  2. Step 2: Convert to fraction form
    723.68/1,085.66 = 338.94/x
  3. Step 3: Cross multiply
    723.68x = 1,085.66 × 338.94
  4. Step 4: Simplify right side
    723.68x = 367,973.60
  5. Step 5: Solve for x
    x = 367,973.60/723.68
  6. Step 6: Final answer
    x = 508.48

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.