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Finding the Fourth Proportional to 610.67, 914.49 and 427.21

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Solution

The fourth proportional to 610.67, 914.49 and 427.21 is: 639.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    610.67 : 914.49 = 427.21 : x
  2. Step 2: Convert to fraction form
    610.67/914.49 = 427.21/x
  3. Step 3: Cross multiply
    610.67x = 914.49 × 427.21
  4. Step 4: Simplify right side
    610.67x = 390,678.40
  5. Step 5: Solve for x
    x = 390,678.40/610.67
  6. Step 6: Final answer
    x = 639.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.