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Finding the Fourth Proportional to 671.98, 1,005.80 and 346.90

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Solution

The fourth proportional to 671.98, 1,005.80 and 346.90 is: 519.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    671.98 : 1,005.80 = 346.90 : x
  2. Step 2: Convert to fraction form
    671.98/1,005.80 = 346.90/x
  3. Step 3: Cross multiply
    671.98x = 1,005.80 × 346.90
  4. Step 4: Simplify right side
    671.98x = 348,912.02
  5. Step 5: Solve for x
    x = 348,912.02/671.98
  6. Step 6: Final answer
    x = 519.23

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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.