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Finding the Fourth Proportional to 738.21, 1,104.93 and 391.05

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Solution

The fourth proportional to 738.21, 1,104.93 and 391.05 is: 585.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.21 : 1,104.93 = 391.05 : x
  2. Step 2: Convert to fraction form
    738.21/1,104.93 = 391.05/x
  3. Step 3: Cross multiply
    738.21x = 1,104.93 × 391.05
  4. Step 4: Simplify right side
    738.21x = 432,082.88
  5. Step 5: Solve for x
    x = 432,082.88/738.21
  6. Step 6: Final answer
    x = 585.31

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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.