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Finding the Fourth Proportional to 520.76, 719.06 and 321.87

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Solution

The fourth proportional to 520.76, 719.06 and 321.87 is: 444.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.76 : 719.06 = 321.87 : x
  2. Step 2: Convert to fraction form
    520.76/719.06 = 321.87/x
  3. Step 3: Cross multiply
    520.76x = 719.06 × 321.87
  4. Step 4: Simplify right side
    520.76x = 231,446.14
  5. Step 5: Solve for x
    x = 231,446.14/520.76
  6. Step 6: Final answer
    x = 444.44

Related Problems

Find fourth proportional to 260.38, 359.53 and 160.94
Half scale
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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.