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Finding the Fourth Proportional to 520.55, 718.25 and 310.76

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Solution

The fourth proportional to 520.55, 718.25 and 310.76 is: 428.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.55 : 718.25 = 310.76 : x
  2. Step 2: Convert to fraction form
    520.55/718.25 = 310.76/x
  3. Step 3: Cross multiply
    520.55x = 718.25 × 310.76
  4. Step 4: Simplify right side
    520.55x = 223,203.61
  5. Step 5: Solve for x
    x = 223,203.61/520.55
  6. Step 6: Final answer
    x = 428.78

Related Problems

Find fourth proportional to 260.28, 359.12 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.