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Finding the Fourth Proportional to 639.51, 883.40 and 493.98

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Solution

The fourth proportional to 639.51, 883.40 and 493.98 is: 682.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.51 : 883.40 = 493.98 : x
  2. Step 2: Convert to fraction form
    639.51/883.40 = 493.98/x
  3. Step 3: Cross multiply
    639.51x = 883.40 × 493.98
  4. Step 4: Simplify right side
    639.51x = 436,381.93
  5. Step 5: Solve for x
    x = 436,381.93/639.51
  6. Step 6: Final answer
    x = 682.37

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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.