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Finding the Fourth Proportional to 520.59, 718.34 and 310.77

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Solution

The fourth proportional to 520.59, 718.34 and 310.77 is: 428.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.59 : 718.34 = 310.77 : x
  2. Step 2: Convert to fraction form
    520.59/718.34 = 310.77/x
  3. Step 3: Cross multiply
    520.59x = 718.34 × 310.77
  4. Step 4: Simplify right side
    520.59x = 223,233.38
  5. Step 5: Solve for x
    x = 223,233.38/520.59
  6. Step 6: Final answer
    x = 428.81

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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.