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Finding the Fourth Proportional to 609.48, 913.23 and 427.08

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Solution

The fourth proportional to 609.48, 913.23 and 427.08 is: 639.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.48 : 913.23 = 427.08 : x
  2. Step 2: Convert to fraction form
    609.48/913.23 = 427.08/x
  3. Step 3: Cross multiply
    609.48x = 913.23 × 427.08
  4. Step 4: Simplify right side
    609.48x = 390,022.27
  5. Step 5: Solve for x
    x = 390,022.27/609.48
  6. Step 6: Final answer
    x = 639.93

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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.