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Finding the Fourth Proportional to 501.05, 691.28 and 279.96

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Solution

The fourth proportional to 501.05, 691.28 and 279.96 is: 386.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.05 : 691.28 = 279.96 : x
  2. Step 2: Convert to fraction form
    501.05/691.28 = 279.96/x
  3. Step 3: Cross multiply
    501.05x = 691.28 × 279.96
  4. Step 4: Simplify right side
    501.05x = 193,530.75
  5. Step 5: Solve for x
    x = 193,530.75/501.05
  6. Step 6: Final answer
    x = 386.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.