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Finding the Fourth Proportional to 694.57, 1,041.40 and 386.12

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Solution

The fourth proportional to 694.57, 1,041.40 and 386.12 is: 578.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.57 : 1,041.40 = 386.12 : x
  2. Step 2: Convert to fraction form
    694.57/1,041.40 = 386.12/x
  3. Step 3: Cross multiply
    694.57x = 1,041.40 × 386.12
  4. Step 4: Simplify right side
    694.57x = 402,105.37
  5. Step 5: Solve for x
    x = 402,105.37/694.57
  6. Step 6: Final answer
    x = 578.93

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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.