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Finding the Fourth Proportional to 520.90, 781.35 and 174.32

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Solution

The fourth proportional to 520.90, 781.35 and 174.32 is: 261.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.90 : 781.35 = 174.32 : x
  2. Step 2: Convert to fraction form
    520.90/781.35 = 174.32/x
  3. Step 3: Cross multiply
    520.90x = 781.35 × 174.32
  4. Step 4: Simplify right side
    520.90x = 136,203.30
  5. Step 5: Solve for x
    x = 136,203.30/520.90
  6. Step 6: Final answer
    x = 261.48

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.