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Finding the Fourth Proportional to 465.78, 642.75 and 266.60

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Solution

The fourth proportional to 465.78, 642.75 and 266.60 is: 367.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.78 : 642.75 = 266.60 : x
  2. Step 2: Convert to fraction form
    465.78/642.75 = 266.60/x
  3. Step 3: Cross multiply
    465.78x = 642.75 × 266.60
  4. Step 4: Simplify right side
    465.78x = 171,357.15
  5. Step 5: Solve for x
    x = 171,357.15/465.78
  6. Step 6: Final answer
    x = 367.89

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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.