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Finding the Fourth Proportional to 520.39, 717.46 and 431.55

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Solution

The fourth proportional to 520.39, 717.46 and 431.55 is: 594.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.39 : 717.46 = 431.55 : x
  2. Step 2: Convert to fraction form
    520.39/717.46 = 431.55/x
  3. Step 3: Cross multiply
    520.39x = 717.46 × 431.55
  4. Step 4: Simplify right side
    520.39x = 309,619.86
  5. Step 5: Solve for x
    x = 309,619.86/520.39
  6. Step 6: Final answer
    x = 594.98

Related Problems

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Half scale
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Double scale
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Similar ratio
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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.