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Finding the Fourth Proportional to 1,012.72, 1,396.53 and 698.01

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Solution

The fourth proportional to 1,012.72, 1,396.53 and 698.01 is: 962.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.72 : 1,396.53 = 698.01 : x
  2. Step 2: Convert to fraction form
    1,012.72/1,396.53 = 698.01/x
  3. Step 3: Cross multiply
    1,012.72x = 1,396.53 × 698.01
  4. Step 4: Simplify right side
    1,012.72x = 974,791.91
  5. Step 5: Solve for x
    x = 974,791.91/1,012.72
  6. Step 6: Final answer
    x = 962.55

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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.