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Finding the Fourth Proportional to 520.99, 718.71 and 380.87

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Solution

The fourth proportional to 520.99, 718.71 and 380.87 is: 525.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.99 : 718.71 = 380.87 : x
  2. Step 2: Convert to fraction form
    520.99/718.71 = 380.87/x
  3. Step 3: Cross multiply
    520.99x = 718.71 × 380.87
  4. Step 4: Simplify right side
    520.99x = 273,735.08
  5. Step 5: Solve for x
    x = 273,735.08/520.99
  6. Step 6: Final answer
    x = 525.42

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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.