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Finding the Fourth Proportional to 522.80, 782.78 and 339.74

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Solution

The fourth proportional to 522.80, 782.78 and 339.74 is: 508.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    522.80 : 782.78 = 339.74 : x
  2. Step 2: Convert to fraction form
    522.80/782.78 = 339.74/x
  3. Step 3: Cross multiply
    522.80x = 782.78 × 339.74
  4. Step 4: Simplify right side
    522.80x = 265,941.68
  5. Step 5: Solve for x
    x = 265,941.68/522.80
  6. Step 6: Final answer
    x = 508.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.