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Finding the Fourth Proportional to 722.76, 997.68 and 428.28

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Solution

The fourth proportional to 722.76, 997.68 and 428.28 is: 591.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.76 : 997.68 = 428.28 : x
  2. Step 2: Convert to fraction form
    722.76/997.68 = 428.28/x
  3. Step 3: Cross multiply
    722.76x = 997.68 × 428.28
  4. Step 4: Simplify right side
    722.76x = 427,286.39
  5. Step 5: Solve for x
    x = 427,286.39/722.76
  6. Step 6: Final answer
    x = 591.19

Related Problems

Find fourth proportional to 361.38, 498.84 and 214.14
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.