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Finding the Fourth Proportional to 579.91, 870 and 189.91

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Solution

The fourth proportional to 579.91, 870 and 189.91 is: 284.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.91 : 870 = 189.91 : x
  2. Step 2: Convert to fraction form
    579.91/870 = 189.91/x
  3. Step 3: Cross multiply
    579.91x = 870 × 189.91
  4. Step 4: Simplify right side
    579.91x = 165,221.70
  5. Step 5: Solve for x
    x = 165,221.70/579.91
  6. Step 6: Final answer
    x = 284.91

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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.