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Finding the Fourth Proportional to 253.65, 380.48 and 91.28

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Solution

The fourth proportional to 253.65, 380.48 and 91.28 is: 136.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.65 : 380.48 = 91.28 : x
  2. Step 2: Convert to fraction form
    253.65/380.48 = 91.28/x
  3. Step 3: Cross multiply
    253.65x = 380.48 × 91.28
  4. Step 4: Simplify right side
    253.65x = 34,727.86
  5. Step 5: Solve for x
    x = 34,727.86/253.65
  6. Step 6: Final answer
    x = 136.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.