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Finding the Fourth Proportional to 520.44, 718.35 and 310.76

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Solution

The fourth proportional to 520.44, 718.35 and 310.76 is: 428.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.44 : 718.35 = 310.76 : x
  2. Step 2: Convert to fraction form
    520.44/718.35 = 310.76/x
  3. Step 3: Cross multiply
    520.44x = 718.35 × 310.76
  4. Step 4: Simplify right side
    520.44x = 223,234.45
  5. Step 5: Solve for x
    x = 223,234.45/520.44
  6. Step 6: Final answer
    x = 428.93

Related Problems

Find fourth proportional to 260.22, 359.18 and 155.38
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.