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Finding the Fourth Proportional to 693.71, 1,039.65 and 385.41

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Solution

The fourth proportional to 693.71, 1,039.65 and 385.41 is: 577.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    693.71 : 1,039.65 = 385.41 : x
  2. Step 2: Convert to fraction form
    693.71/1,039.65 = 385.41/x
  3. Step 3: Cross multiply
    693.71x = 1,039.65 × 385.41
  4. Step 4: Simplify right side
    693.71x = 400,691.51
  5. Step 5: Solve for x
    x = 400,691.51/693.71
  6. Step 6: Final answer
    x = 577.61

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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.