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Finding the Fourth Proportional to 385.64, 532.16 and 261.58

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Solution

The fourth proportional to 385.64, 532.16 and 261.58 is: 360.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.64 : 532.16 = 261.58 : x
  2. Step 2: Convert to fraction form
    385.64/532.16 = 261.58/x
  3. Step 3: Cross multiply
    385.64x = 532.16 × 261.58
  4. Step 4: Simplify right side
    385.64x = 139,202.41
  5. Step 5: Solve for x
    x = 139,202.41/385.64
  6. Step 6: Final answer
    x = 360.96

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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.