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Finding the Fourth Proportional to 639.91, 882.93 and 378.01

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Solution

The fourth proportional to 639.91, 882.93 and 378.01 is: 521.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.91 : 882.93 = 378.01 : x
  2. Step 2: Convert to fraction form
    639.91/882.93 = 378.01/x
  3. Step 3: Cross multiply
    639.91x = 882.93 × 378.01
  4. Step 4: Simplify right side
    639.91x = 333,756.37
  5. Step 5: Solve for x
    x = 333,756.37/639.91
  6. Step 6: Final answer
    x = 521.57

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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.