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Finding the Fourth Proportional to 519.84, 717.12 and 309.95

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Solution

The fourth proportional to 519.84, 717.12 and 309.95 is: 427.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.84 : 717.12 = 309.95 : x
  2. Step 2: Convert to fraction form
    519.84/717.12 = 309.95/x
  3. Step 3: Cross multiply
    519.84x = 717.12 × 309.95
  4. Step 4: Simplify right side
    519.84x = 222,271.61
  5. Step 5: Solve for x
    x = 222,271.61/519.84
  6. Step 6: Final answer
    x = 427.58

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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.