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Finding the Fourth Proportional to 991.06, 1,487.28 and 442.96

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Solution

The fourth proportional to 991.06, 1,487.28 and 442.96 is: 664.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.06 : 1,487.28 = 442.96 : x
  2. Step 2: Convert to fraction form
    991.06/1,487.28 = 442.96/x
  3. Step 3: Cross multiply
    991.06x = 1,487.28 × 442.96
  4. Step 4: Simplify right side
    991.06x = 658,805.55
  5. Step 5: Solve for x
    x = 658,805.55/991.06
  6. Step 6: Final answer
    x = 664.75

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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.