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Finding the Fourth Proportional to 520.19, 717.98 and 321.31

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Solution

The fourth proportional to 520.19, 717.98 and 321.31 is: 443.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.19 : 717.98 = 321.31 : x
  2. Step 2: Convert to fraction form
    520.19/717.98 = 321.31/x
  3. Step 3: Cross multiply
    520.19x = 717.98 × 321.31
  4. Step 4: Simplify right side
    520.19x = 230,693.16
  5. Step 5: Solve for x
    x = 230,693.16/520.19
  6. Step 6: Final answer
    x = 443.48

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Double scale
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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.