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Finding the Fourth Proportional to 519.56, 716.88 and 312.56

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Solution

The fourth proportional to 519.56, 716.88 and 312.56 is: 431.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.56 : 716.88 = 312.56 : x
  2. Step 2: Convert to fraction form
    519.56/716.88 = 312.56/x
  3. Step 3: Cross multiply
    519.56x = 716.88 × 312.56
  4. Step 4: Simplify right side
    519.56x = 224,068.01
  5. Step 5: Solve for x
    x = 224,068.01/519.56
  6. Step 6: Final answer
    x = 431.26

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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.