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Finding the Fourth Proportional to 465.42, 642.15 and 266.25

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Solution

The fourth proportional to 465.42, 642.15 and 266.25 is: 367.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.42 : 642.15 = 266.25 : x
  2. Step 2: Convert to fraction form
    465.42/642.15 = 266.25/x
  3. Step 3: Cross multiply
    465.42x = 642.15 × 266.25
  4. Step 4: Simplify right side
    465.42x = 170,972.44
  5. Step 5: Solve for x
    x = 170,972.44/465.42
  6. Step 6: Final answer
    x = 367.35

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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.