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Finding the Fourth Proportional to 521.19, 777 and 480.09

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Solution

The fourth proportional to 521.19, 777 and 480.09 is: 715.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.19 : 777 = 480.09 : x
  2. Step 2: Convert to fraction form
    521.19/777 = 480.09/x
  3. Step 3: Cross multiply
    521.19x = 777 × 480.09
  4. Step 4: Simplify right side
    521.19x = 373,029.93
  5. Step 5: Solve for x
    x = 373,029.93/521.19
  6. Step 6: Final answer
    x = 715.73

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.