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Finding the Fourth Proportional to 253.16, 379.73 and 145.70

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Solution

The fourth proportional to 253.16, 379.73 and 145.70 is: 218.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.16 : 379.73 = 145.70 : x
  2. Step 2: Convert to fraction form
    253.16/379.73 = 145.70/x
  3. Step 3: Cross multiply
    253.16x = 379.73 × 145.70
  4. Step 4: Simplify right side
    253.16x = 55,326.66
  5. Step 5: Solve for x
    x = 55,326.66/253.16
  6. Step 6: Final answer
    x = 218.54

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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.