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Finding the Fourth Proportional to 308.53, 424.80 and 261.81

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Solution

The fourth proportional to 308.53, 424.80 and 261.81 is: 360.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.53 : 424.80 = 261.81 : x
  2. Step 2: Convert to fraction form
    308.53/424.80 = 261.81/x
  3. Step 3: Cross multiply
    308.53x = 424.80 × 261.81
  4. Step 4: Simplify right side
    308.53x = 111,216.89
  5. Step 5: Solve for x
    x = 111,216.89/308.53
  6. Step 6: Final answer
    x = 360.47

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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.