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Finding the Fourth Proportional to 520.72, 718.62 and 299.74

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Solution

The fourth proportional to 520.72, 718.62 and 299.74 is: 413.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.72 : 718.62 = 299.74 : x
  2. Step 2: Convert to fraction form
    520.72/718.62 = 299.74/x
  3. Step 3: Cross multiply
    520.72x = 718.62 × 299.74
  4. Step 4: Simplify right side
    520.72x = 215,399.16
  5. Step 5: Solve for x
    x = 215,399.16/520.72
  6. Step 6: Final answer
    x = 413.66

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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.