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Finding the Fourth Proportional to 628.56, 866.88 and 395.64

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Solution

The fourth proportional to 628.56, 866.88 and 395.64 is: 545.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.56 : 866.88 = 395.64 : x
  2. Step 2: Convert to fraction form
    628.56/866.88 = 395.64/x
  3. Step 3: Cross multiply
    628.56x = 866.88 × 395.64
  4. Step 4: Simplify right side
    628.56x = 342,972.40
  5. Step 5: Solve for x
    x = 342,972.40/628.56
  6. Step 6: Final answer
    x = 545.65

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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.