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Finding the Fourth Proportional to 519.20, 716.66 and 309.53

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Solution

The fourth proportional to 519.20, 716.66 and 309.53 is: 427.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.20 : 716.66 = 309.53 : x
  2. Step 2: Convert to fraction form
    519.20/716.66 = 309.53/x
  3. Step 3: Cross multiply
    519.20x = 716.66 × 309.53
  4. Step 4: Simplify right side
    519.20x = 221,827.77
  5. Step 5: Solve for x
    x = 221,827.77/519.20
  6. Step 6: Final answer
    x = 427.25

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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.