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Finding the Fourth Proportional to 1,012.64, 1,393.27 and 791.21

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Solution

The fourth proportional to 1,012.64, 1,393.27 and 791.21 is: 1,088.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,012.64 : 1,393.27 = 791.21 : x
  2. Step 2: Convert to fraction form
    1,012.64/1,393.27 = 791.21/x
  3. Step 3: Cross multiply
    1,012.64x = 1,393.27 × 791.21
  4. Step 4: Simplify right side
    1,012.64x = 1,102,369.16
  5. Step 5: Solve for x
    x = 1,102,369.16/1,012.64
  6. Step 6: Final answer
    x = 1,088.61

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1.5x scale

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.