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Finding the Fourth Proportional to 642.36, 886.38 and 376.61

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Solution

The fourth proportional to 642.36, 886.38 and 376.61 is: 519.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.36 : 886.38 = 376.61 : x
  2. Step 2: Convert to fraction form
    642.36/886.38 = 376.61/x
  3. Step 3: Cross multiply
    642.36x = 886.38 × 376.61
  4. Step 4: Simplify right side
    642.36x = 333,815.14
  5. Step 5: Solve for x
    x = 333,815.14/642.36
  6. Step 6: Final answer
    x = 519.67

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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.