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Finding the Fourth Proportional to 385.74, 531.28 and 287.32

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Solution

The fourth proportional to 385.74, 531.28 and 287.32 is: 395.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.74 : 531.28 = 287.32 : x
  2. Step 2: Convert to fraction form
    385.74/531.28 = 287.32/x
  3. Step 3: Cross multiply
    385.74x = 531.28 × 287.32
  4. Step 4: Simplify right side
    385.74x = 152,647.37
  5. Step 5: Solve for x
    x = 152,647.37/385.74
  6. Step 6: Final answer
    x = 395.73

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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.