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Finding the Fourth Proportional to 639.95, 883.13 and 378.02

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Solution

The fourth proportional to 639.95, 883.13 and 378.02 is: 521.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.95 : 883.13 = 378.02 : x
  2. Step 2: Convert to fraction form
    639.95/883.13 = 378.02/x
  3. Step 3: Cross multiply
    639.95x = 883.13 × 378.02
  4. Step 4: Simplify right side
    639.95x = 333,834.50
  5. Step 5: Solve for x
    x = 333,834.50/639.95
  6. Step 6: Final answer
    x = 521.66

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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.