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Finding the Fourth Proportional to 722.92, 997.72 and 428.30

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Solution

The fourth proportional to 722.92, 997.72 and 428.30 is: 591.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.92 : 997.72 = 428.30 : x
  2. Step 2: Convert to fraction form
    722.92/997.72 = 428.30/x
  3. Step 3: Cross multiply
    722.92x = 997.72 × 428.30
  4. Step 4: Simplify right side
    722.92x = 427,323.48
  5. Step 5: Solve for x
    x = 427,323.48/722.92
  6. Step 6: Final answer
    x = 591.11

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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.