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Finding the Fourth Proportional to 643.41, 887.99 and 469.17

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Solution

The fourth proportional to 643.41, 887.99 and 469.17 is: 647.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.41 : 887.99 = 469.17 : x
  2. Step 2: Convert to fraction form
    643.41/887.99 = 469.17/x
  3. Step 3: Cross multiply
    643.41x = 887.99 × 469.17
  4. Step 4: Simplify right side
    643.41x = 416,615.92
  5. Step 5: Solve for x
    x = 416,615.92/643.41
  6. Step 6: Final answer
    x = 647.51

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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.