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Finding the Fourth Proportional to 643.19, 887.60 and 348.46

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Solution

The fourth proportional to 643.19, 887.60 and 348.46 is: 480.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.19 : 887.60 = 348.46 : x
  2. Step 2: Convert to fraction form
    643.19/887.60 = 348.46/x
  3. Step 3: Cross multiply
    643.19x = 887.60 × 348.46
  4. Step 4: Simplify right side
    643.19x = 309,291.75
  5. Step 5: Solve for x
    x = 309,291.75/643.19
  6. Step 6: Final answer
    x = 480.88

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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.