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Finding the Fourth Proportional to 643.07, 887.43 and 348.34

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Solution

The fourth proportional to 643.07, 887.43 and 348.34 is: 480.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.07 : 887.43 = 348.34 : x
  2. Step 2: Convert to fraction form
    643.07/887.43 = 348.34/x
  3. Step 3: Cross multiply
    643.07x = 887.43 × 348.34
  4. Step 4: Simplify right side
    643.07x = 309,125.15
  5. Step 5: Solve for x
    x = 309,125.15/643.07
  6. Step 6: Final answer
    x = 480.70

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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.