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Finding the Fourth Proportional to 385.71, 531.87 and 275.15

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Solution

The fourth proportional to 385.71, 531.87 and 275.15 is: 379.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.71 : 531.87 = 275.15 : x
  2. Step 2: Convert to fraction form
    385.71/531.87 = 275.15/x
  3. Step 3: Cross multiply
    385.71x = 531.87 × 275.15
  4. Step 4: Simplify right side
    385.71x = 146,341.37
  5. Step 5: Solve for x
    x = 146,341.37/385.71
  6. Step 6: Final answer
    x = 379.41

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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.