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Finding the Fourth Proportional to 671.87, 1,009.31 and 425.82

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Solution

The fourth proportional to 671.87, 1,009.31 and 425.82 is: 639.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.87 : 1,009.31 = 425.82 : x
  2. Step 2: Convert to fraction form
    671.87/1,009.31 = 425.82/x
  3. Step 3: Cross multiply
    671.87x = 1,009.31 × 425.82
  4. Step 4: Simplify right side
    671.87x = 429,782.26
  5. Step 5: Solve for x
    x = 429,782.26/671.87
  6. Step 6: Final answer
    x = 639.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.