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Finding the Fourth Proportional to 521.12, 719.02 and 311.36

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Solution

The fourth proportional to 521.12, 719.02 and 311.36 is: 429.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.12 : 719.02 = 311.36 : x
  2. Step 2: Convert to fraction form
    521.12/719.02 = 311.36/x
  3. Step 3: Cross multiply
    521.12x = 719.02 × 311.36
  4. Step 4: Simplify right side
    521.12x = 223,877.80
  5. Step 5: Solve for x
    x = 223,877.80/521.12
  6. Step 6: Final answer
    x = 429.61

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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.