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Finding the Fourth Proportional to 375.60, 515.91 and 309.96

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Solution

The fourth proportional to 375.60, 515.91 and 309.96 is: 425.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    375.60 : 515.91 = 309.96 : x
  2. Step 2: Convert to fraction form
    375.60/515.91 = 309.96/x
  3. Step 3: Cross multiply
    375.60x = 515.91 × 309.96
  4. Step 4: Simplify right side
    375.60x = 159,911.46
  5. Step 5: Solve for x
    x = 159,911.46/375.60
  6. Step 6: Final answer
    x = 425.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.