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Finding the Fourth Proportional to 520.15, 717.89 and 395.61

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Solution

The fourth proportional to 520.15, 717.89 and 395.61 is: 546.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.15 : 717.89 = 395.61 : x
  2. Step 2: Convert to fraction form
    520.15/717.89 = 395.61/x
  3. Step 3: Cross multiply
    520.15x = 717.89 × 395.61
  4. Step 4: Simplify right side
    520.15x = 284,004.46
  5. Step 5: Solve for x
    x = 284,004.46/520.15
  6. Step 6: Final answer
    x = 546.00

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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.