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Finding the Fourth Proportional to 991.79, 1,487.28 and 628.37

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Solution

The fourth proportional to 991.79, 1,487.28 and 628.37 is: 942.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.79 : 1,487.28 = 628.37 : x
  2. Step 2: Convert to fraction form
    991.79/1,487.28 = 628.37/x
  3. Step 3: Cross multiply
    991.79x = 1,487.28 × 628.37
  4. Step 4: Simplify right side
    991.79x = 934,562.13
  5. Step 5: Solve for x
    x = 934,562.13/991.79
  6. Step 6: Final answer
    x = 942.30

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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.