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Finding the Fourth Proportional to 1,011.93, 1,391.42 and 864.30

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Solution

The fourth proportional to 1,011.93, 1,391.42 and 864.30 is: 1,188.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.93 : 1,391.42 = 864.30 : x
  2. Step 2: Convert to fraction form
    1,011.93/1,391.42 = 864.30/x
  3. Step 3: Cross multiply
    1,011.93x = 1,391.42 × 864.30
  4. Step 4: Simplify right side
    1,011.93x = 1,202,599.98
  5. Step 5: Solve for x
    x = 1,202,599.98/1,011.93
  6. Step 6: Final answer
    x = 1,188.42

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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.