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Finding the Fourth Proportional to 694.04, 1,038.45 and 415.37

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Solution

The fourth proportional to 694.04, 1,038.45 and 415.37 is: 621.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.04 : 1,038.45 = 415.37 : x
  2. Step 2: Convert to fraction form
    694.04/1,038.45 = 415.37/x
  3. Step 3: Cross multiply
    694.04x = 1,038.45 × 415.37
  4. Step 4: Simplify right side
    694.04x = 431,340.98
  5. Step 5: Solve for x
    x = 431,340.98/694.04
  6. Step 6: Final answer
    x = 621.49

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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.