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Finding the Fourth Proportional to 998.31, 1,376.23 and 702.66

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Solution

The fourth proportional to 998.31, 1,376.23 and 702.66 is: 968.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.31 : 1,376.23 = 702.66 : x
  2. Step 2: Convert to fraction form
    998.31/1,376.23 = 702.66/x
  3. Step 3: Cross multiply
    998.31x = 1,376.23 × 702.66
  4. Step 4: Simplify right side
    998.31x = 967,021.77
  5. Step 5: Solve for x
    x = 967,021.77/998.31
  6. Step 6: Final answer
    x = 968.66

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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.