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Finding the Fourth Proportional to 986.10, 1,359.24 and 749.28

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Solution

The fourth proportional to 986.10, 1,359.24 and 749.28 is: 1,032.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.10 : 1,359.24 = 749.28 : x
  2. Step 2: Convert to fraction form
    986.10/1,359.24 = 749.28/x
  3. Step 3: Cross multiply
    986.10x = 1,359.24 × 749.28
  4. Step 4: Simplify right side
    986.10x = 1,018,451.35
  5. Step 5: Solve for x
    x = 1,018,451.35/986.10
  6. Step 6: Final answer
    x = 1,032.81

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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.