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Finding the Fourth Proportional to 643.91, 888.61 and 381.93

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Solution

The fourth proportional to 643.91, 888.61 and 381.93 is: 527.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.91 : 888.61 = 381.93 : x
  2. Step 2: Convert to fraction form
    643.91/888.61 = 381.93/x
  3. Step 3: Cross multiply
    643.91x = 888.61 × 381.93
  4. Step 4: Simplify right side
    643.91x = 339,386.82
  5. Step 5: Solve for x
    x = 339,386.82/643.91
  6. Step 6: Final answer
    x = 527.07

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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.