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Finding the Fourth Proportional to 520.40, 717.60 and 365.12

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Solution

The fourth proportional to 520.40, 717.60 and 365.12 is: 503.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.40 : 717.60 = 365.12 : x
  2. Step 2: Convert to fraction form
    520.40/717.60 = 365.12/x
  3. Step 3: Cross multiply
    520.40x = 717.60 × 365.12
  4. Step 4: Simplify right side
    520.40x = 262,010.11
  5. Step 5: Solve for x
    x = 262,010.11/520.40
  6. Step 6: Final answer
    x = 503.48

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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.