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Finding the Fourth Proportional to 628.15, 866.42 and 442.03

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Solution

The fourth proportional to 628.15, 866.42 and 442.03 is: 609.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.15 : 866.42 = 442.03 : x
  2. Step 2: Convert to fraction form
    628.15/866.42 = 442.03/x
  3. Step 3: Cross multiply
    628.15x = 866.42 × 442.03
  4. Step 4: Simplify right side
    628.15x = 382,981.42
  5. Step 5: Solve for x
    x = 382,981.42/628.15
  6. Step 6: Final answer
    x = 609.70

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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.