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Finding the Fourth Proportional to 520.80, 718.77 and 396.60

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Solution

The fourth proportional to 520.80, 718.77 and 396.60 is: 547.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.80 : 718.77 = 396.60 : x
  2. Step 2: Convert to fraction form
    520.80/718.77 = 396.60/x
  3. Step 3: Cross multiply
    520.80x = 718.77 × 396.60
  4. Step 4: Simplify right side
    520.80x = 285,064.18
  5. Step 5: Solve for x
    x = 285,064.18/520.80
  6. Step 6: Final answer
    x = 547.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.