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Finding the Fourth Proportional to 521.75, 720.12 and 300.83

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Solution

The fourth proportional to 521.75, 720.12 and 300.83 is: 415.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.75 : 720.12 = 300.83 : x
  2. Step 2: Convert to fraction form
    521.75/720.12 = 300.83/x
  3. Step 3: Cross multiply
    521.75x = 720.12 × 300.83
  4. Step 4: Simplify right side
    521.75x = 216,630.10
  5. Step 5: Solve for x
    x = 216,630.10/521.75
  6. Step 6: Final answer
    x = 415.20

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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.