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Finding the Fourth Proportional to 465.54, 642.14 and 286

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Solution

The fourth proportional to 465.54, 642.14 and 286 is: 394.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.54 : 642.14 = 286 : x
  2. Step 2: Convert to fraction form
    465.54/642.14 = 286/x
  3. Step 3: Cross multiply
    465.54x = 642.14 × 286
  4. Step 4: Simplify right side
    465.54x = 183,652.04
  5. Step 5: Solve for x
    x = 183,652.04/465.54
  6. Step 6: Final answer
    x = 394.49

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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.