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Finding the Fourth Proportional to 385.48, 531.76 and 261.20

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Solution

The fourth proportional to 385.48, 531.76 and 261.20 is: 360.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.48 : 531.76 = 261.20 : x
  2. Step 2: Convert to fraction form
    385.48/531.76 = 261.20/x
  3. Step 3: Cross multiply
    385.48x = 531.76 × 261.20
  4. Step 4: Simplify right side
    385.48x = 138,895.71
  5. Step 5: Solve for x
    x = 138,895.71/385.48
  6. Step 6: Final answer
    x = 360.32

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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.