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Finding the Fourth Proportional to 253.31, 379.89 and 70.69

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Solution

The fourth proportional to 253.31, 379.89 and 70.69 is: 106.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.31 : 379.89 = 70.69 : x
  2. Step 2: Convert to fraction form
    253.31/379.89 = 70.69/x
  3. Step 3: Cross multiply
    253.31x = 379.89 × 70.69
  4. Step 4: Simplify right side
    253.31x = 26,854.42
  5. Step 5: Solve for x
    x = 26,854.42/253.31
  6. Step 6: Final answer
    x = 106.01

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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.