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Finding the Fourth Proportional to 579.99, 869.96 and 147.15

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Solution

The fourth proportional to 579.99, 869.96 and 147.15 is: 220.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.99 : 869.96 = 147.15 : x
  2. Step 2: Convert to fraction form
    579.99/869.96 = 147.15/x
  3. Step 3: Cross multiply
    579.99x = 869.96 × 147.15
  4. Step 4: Simplify right side
    579.99x = 128,014.15
  5. Step 5: Solve for x
    x = 128,014.15/579.99
  6. Step 6: Final answer
    x = 220.72

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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.