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Finding the Fourth Proportional to 521.46, 719.55 and 311.67

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Solution

The fourth proportional to 521.46, 719.55 and 311.67 is: 430.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.46 : 719.55 = 311.67 : x
  2. Step 2: Convert to fraction form
    521.46/719.55 = 311.67/x
  3. Step 3: Cross multiply
    521.46x = 719.55 × 311.67
  4. Step 4: Simplify right side
    521.46x = 224,262.15
  5. Step 5: Solve for x
    x = 224,262.15/521.46
  6. Step 6: Final answer
    x = 430.07

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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.