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Finding the Fourth Proportional to 1,012.15, 1,395.28 and 696.90

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Solution

The fourth proportional to 1,012.15, 1,395.28 and 696.90 is: 960.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.15 : 1,395.28 = 696.90 : x
  2. Step 2: Convert to fraction form
    1,012.15/1,395.28 = 696.90/x
  3. Step 3: Cross multiply
    1,012.15x = 1,395.28 × 696.90
  4. Step 4: Simplify right side
    1,012.15x = 972,372.82
  5. Step 5: Solve for x
    x = 972,372.82/1,012.15
  6. Step 6: Final answer
    x = 960.70

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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.