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Finding the Fourth Proportional to 579.87, 868.65 and 457.77

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Solution

The fourth proportional to 579.87, 868.65 and 457.77 is: 685.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    579.87 : 868.65 = 457.77 : x
  2. Step 2: Convert to fraction form
    579.87/868.65 = 457.77/x
  3. Step 3: Cross multiply
    579.87x = 868.65 × 457.77
  4. Step 4: Simplify right side
    579.87x = 397,641.91
  5. Step 5: Solve for x
    x = 397,641.91/579.87
  6. Step 6: Final answer
    x = 685.74

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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.