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Finding the Fourth Proportional to 520.19, 717.85 and 345.86

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Solution

The fourth proportional to 520.19, 717.85 and 345.86 is: 477.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.19 : 717.85 = 345.86 : x
  2. Step 2: Convert to fraction form
    520.19/717.85 = 345.86/x
  3. Step 3: Cross multiply
    520.19x = 717.85 × 345.86
  4. Step 4: Simplify right side
    520.19x = 248,275.60
  5. Step 5: Solve for x
    x = 248,275.60/520.19
  6. Step 6: Final answer
    x = 477.28

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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.