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Finding the Fourth Proportional to 643.78, 889.14 and 433.59

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Solution

The fourth proportional to 643.78, 889.14 and 433.59 is: 598.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.78 : 889.14 = 433.59 : x
  2. Step 2: Convert to fraction form
    643.78/889.14 = 433.59/x
  3. Step 3: Cross multiply
    643.78x = 889.14 × 433.59
  4. Step 4: Simplify right side
    643.78x = 385,518.88
  5. Step 5: Solve for x
    x = 385,518.88/643.78
  6. Step 6: Final answer
    x = 598.84

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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.