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Finding the Fourth Proportional to 1,012.64, 1,398.44 and 698.71

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Solution

The fourth proportional to 1,012.64, 1,398.44 and 698.71 is: 964.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.64 : 1,398.44 = 698.71 : x
  2. Step 2: Convert to fraction form
    1,012.64/1,398.44 = 698.71/x
  3. Step 3: Cross multiply
    1,012.64x = 1,398.44 × 698.71
  4. Step 4: Simplify right side
    1,012.64x = 977,093.53
  5. Step 5: Solve for x
    x = 977,093.53/1,012.64
  6. Step 6: Final answer
    x = 964.90

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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.