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Finding the Fourth Proportional to 643.66, 888.33 and 394.93

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Solution

The fourth proportional to 643.66, 888.33 and 394.93 is: 545.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.66 : 888.33 = 394.93 : x
  2. Step 2: Convert to fraction form
    643.66/888.33 = 394.93/x
  3. Step 3: Cross multiply
    643.66x = 888.33 × 394.93
  4. Step 4: Simplify right side
    643.66x = 350,830.76
  5. Step 5: Solve for x
    x = 350,830.76/643.66
  6. Step 6: Final answer
    x = 545.06

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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.