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Finding the Fourth Proportional to 521.35, 777.60 and 439.62

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Solution

The fourth proportional to 521.35, 777.60 and 439.62 is: 655.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.35 : 777.60 = 439.62 : x
  2. Step 2: Convert to fraction form
    521.35/777.60 = 439.62/x
  3. Step 3: Cross multiply
    521.35x = 777.60 × 439.62
  4. Step 4: Simplify right side
    521.35x = 341,851.98
  5. Step 5: Solve for x
    x = 341,851.98/521.35
  6. Step 6: Final answer
    x = 655.71

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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.