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Finding the Fourth Proportional to 465.61, 642.57 and 255.80

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Solution

The fourth proportional to 465.61, 642.57 and 255.80 is: 353.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.61 : 642.57 = 255.80 : x
  2. Step 2: Convert to fraction form
    465.61/642.57 = 255.80/x
  3. Step 3: Cross multiply
    465.61x = 642.57 × 255.80
  4. Step 4: Simplify right side
    465.61x = 164,364.91
  5. Step 5: Solve for x
    x = 164,364.91/465.61
  6. Step 6: Final answer
    x = 353.01

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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.