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Finding the Fourth Proportional to 1,012.17, 1,395.49 and 679.86

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Solution

The fourth proportional to 1,012.17, 1,395.49 and 679.86 is: 937.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.17 : 1,395.49 = 679.86 : x
  2. Step 2: Convert to fraction form
    1,012.17/1,395.49 = 679.86/x
  3. Step 3: Cross multiply
    1,012.17x = 1,395.49 × 679.86
  4. Step 4: Simplify right side
    1,012.17x = 948,741.36
  5. Step 5: Solve for x
    x = 948,741.36/1,012.17
  6. Step 6: Final answer
    x = 937.34

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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.