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Finding the Fourth Proportional to 379.69, 569.53 and 91.13

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Solution

The fourth proportional to 379.69, 569.53 and 91.13 is: 136.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.69 : 569.53 = 91.13 : x
  2. Step 2: Convert to fraction form
    379.69/569.53 = 91.13/x
  3. Step 3: Cross multiply
    379.69x = 569.53 × 91.13
  4. Step 4: Simplify right side
    379.69x = 51,898.54
  5. Step 5: Solve for x
    x = 51,898.54/379.69
  6. Step 6: Final answer
    x = 136.69

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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.