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Finding the Fourth Proportional to 736.88, 1,105.59 and 390.20

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Solution

The fourth proportional to 736.88, 1,105.59 and 390.20 is: 585.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.88 : 1,105.59 = 390.20 : x
  2. Step 2: Convert to fraction form
    736.88/1,105.59 = 390.20/x
  3. Step 3: Cross multiply
    736.88x = 1,105.59 × 390.20
  4. Step 4: Simplify right side
    736.88x = 431,395.69
  5. Step 5: Solve for x
    x = 431,395.69/736.88
  6. Step 6: Final answer
    x = 585.44

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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.