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Finding the Fourth Proportional to 753.11, 1,039.32 and 438.42

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Solution

The fourth proportional to 753.11, 1,039.32 and 438.42 is: 605.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.11 : 1,039.32 = 438.42 : x
  2. Step 2: Convert to fraction form
    753.11/1,039.32 = 438.42/x
  3. Step 3: Cross multiply
    753.11x = 1,039.32 × 438.42
  4. Step 4: Simplify right side
    753.11x = 455,658.67
  5. Step 5: Solve for x
    x = 455,658.67/753.11
  6. Step 6: Final answer
    x = 605.04

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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.