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Finding the Fourth Proportional to 628.20, 866.35 and 428.94

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Solution

The fourth proportional to 628.20, 866.35 and 428.94 is: 591.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.20 : 866.35 = 428.94 : x
  2. Step 2: Convert to fraction form
    628.20/866.35 = 428.94/x
  3. Step 3: Cross multiply
    628.20x = 866.35 × 428.94
  4. Step 4: Simplify right side
    628.20x = 371,612.17
  5. Step 5: Solve for x
    x = 371,612.17/628.20
  6. Step 6: Final answer
    x = 591.55

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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.