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Finding the Fourth Proportional to 643.52, 888.05 and 348.79

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Solution

The fourth proportional to 643.52, 888.05 and 348.79 is: 481.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.52 : 888.05 = 348.79 : x
  2. Step 2: Convert to fraction form
    643.52/888.05 = 348.79/x
  3. Step 3: Cross multiply
    643.52x = 888.05 × 348.79
  4. Step 4: Simplify right side
    643.52x = 309,743.28
  5. Step 5: Solve for x
    x = 309,743.28/643.52
  6. Step 6: Final answer
    x = 481.33

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1.5x scale

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.