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Finding the Fourth Proportional to 379.90, 570.03 and 136.45

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Solution

The fourth proportional to 379.90, 570.03 and 136.45 is: 204.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.90 : 570.03 = 136.45 : x
  2. Step 2: Convert to fraction form
    379.90/570.03 = 136.45/x
  3. Step 3: Cross multiply
    379.90x = 570.03 × 136.45
  4. Step 4: Simplify right side
    379.90x = 77,780.59
  5. Step 5: Solve for x
    x = 77,780.59/379.90
  6. Step 6: Final answer
    x = 204.74

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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.