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Finding the Fourth Proportional to 519.58, 716.96 and 312.58

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Solution

The fourth proportional to 519.58, 716.96 and 312.58 is: 431.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.58 : 716.96 = 312.58 : x
  2. Step 2: Convert to fraction form
    519.58/716.96 = 312.58/x
  3. Step 3: Cross multiply
    519.58x = 716.96 × 312.58
  4. Step 4: Simplify right side
    519.58x = 224,107.36
  5. Step 5: Solve for x
    x = 224,107.36/519.58
  6. Step 6: Final answer
    x = 431.32

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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.