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Finding the Fourth Proportional to 520.21, 718.23 and 487.11

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Solution

The fourth proportional to 520.21, 718.23 and 487.11 is: 672.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.21 : 718.23 = 487.11 : x
  2. Step 2: Convert to fraction form
    520.21/718.23 = 487.11/x
  3. Step 3: Cross multiply
    520.21x = 718.23 × 487.11
  4. Step 4: Simplify right side
    520.21x = 349,861.54
  5. Step 5: Solve for x
    x = 349,861.54/520.21
  6. Step 6: Final answer
    x = 672.54

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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.