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Finding the Fourth Proportional to 375.90, 561.36 and 321.36

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Solution

The fourth proportional to 375.90, 561.36 and 321.36 is: 479.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.90 : 561.36 = 321.36 : x
  2. Step 2: Convert to fraction form
    375.90/561.36 = 321.36/x
  3. Step 3: Cross multiply
    375.90x = 561.36 × 321.36
  4. Step 4: Simplify right side
    375.90x = 180,398.65
  5. Step 5: Solve for x
    x = 180,398.65/375.90
  6. Step 6: Final answer
    x = 479.91

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.