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Finding the Fourth Proportional to 253.16, 379.28 and 90.74

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Solution

The fourth proportional to 253.16, 379.28 and 90.74 is: 135.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.16 : 379.28 = 90.74 : x
  2. Step 2: Convert to fraction form
    253.16/379.28 = 90.74/x
  3. Step 3: Cross multiply
    253.16x = 379.28 × 90.74
  4. Step 4: Simplify right side
    253.16x = 34,415.87
  5. Step 5: Solve for x
    x = 34,415.87/253.16
  6. Step 6: Final answer
    x = 135.95

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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.