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Finding the Fourth Proportional to 521.88, 720.17 and 312.30

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Solution

The fourth proportional to 521.88, 720.17 and 312.30 is: 430.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.88 : 720.17 = 312.30 : x
  2. Step 2: Convert to fraction form
    521.88/720.17 = 312.30/x
  3. Step 3: Cross multiply
    521.88x = 720.17 × 312.30
  4. Step 4: Simplify right side
    521.88x = 224,907.53
  5. Step 5: Solve for x
    x = 224,907.53/521.88
  6. Step 6: Final answer
    x = 430.96

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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.