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Finding the Fourth Proportional to 521.75, 720.02 and 314.75

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Solution

The fourth proportional to 521.75, 720.02 and 314.75 is: 434.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.75 : 720.02 = 314.75 : x
  2. Step 2: Convert to fraction form
    521.75/720.02 = 314.75/x
  3. Step 3: Cross multiply
    521.75x = 720.02 × 314.75
  4. Step 4: Simplify right side
    521.75x = 226,626.30
  5. Step 5: Solve for x
    x = 226,626.30/521.75
  6. Step 6: Final answer
    x = 434.36

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1.5x scale

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.