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Finding the Fourth Proportional to 671.15, 1,005.95 and 397.47

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Solution

The fourth proportional to 671.15, 1,005.95 and 397.47 is: 595.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.15 : 1,005.95 = 397.47 : x
  2. Step 2: Convert to fraction form
    671.15/1,005.95 = 397.47/x
  3. Step 3: Cross multiply
    671.15x = 1,005.95 × 397.47
  4. Step 4: Simplify right side
    671.15x = 399,832.96
  5. Step 5: Solve for x
    x = 399,832.96/671.15
  6. Step 6: Final answer
    x = 595.74

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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.