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Finding the Fourth Proportional to 521.60, 718.25 and 396.77

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Solution

The fourth proportional to 521.60, 718.25 and 396.77 is: 546.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.60 : 718.25 = 396.77 : x
  2. Step 2: Convert to fraction form
    521.60/718.25 = 396.77/x
  3. Step 3: Cross multiply
    521.60x = 718.25 × 396.77
  4. Step 4: Simplify right side
    521.60x = 284,974.48
  5. Step 5: Solve for x
    x = 284,974.48/521.60
  6. Step 6: Final answer
    x = 546.35

Related Problems

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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.