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Finding the Fourth Proportional to 253.29, 379.66 and 99.15

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Solution

The fourth proportional to 253.29, 379.66 and 99.15 is: 148.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.29 : 379.66 = 99.15 : x
  2. Step 2: Convert to fraction form
    253.29/379.66 = 99.15/x
  3. Step 3: Cross multiply
    253.29x = 379.66 × 99.15
  4. Step 4: Simplify right side
    253.29x = 37,643.29
  5. Step 5: Solve for x
    x = 37,643.29/253.29
  6. Step 6: Final answer
    x = 148.62

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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.