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Finding the Fourth Proportional to 639.19, 881.74 and 429.01

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Solution

The fourth proportional to 639.19, 881.74 and 429.01 is: 591.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.19 : 881.74 = 429.01 : x
  2. Step 2: Convert to fraction form
    639.19/881.74 = 429.01/x
  3. Step 3: Cross multiply
    639.19x = 881.74 × 429.01
  4. Step 4: Simplify right side
    639.19x = 378,272.00
  5. Step 5: Solve for x
    x = 378,272.00/639.19
  6. Step 6: Final answer
    x = 591.80

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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.