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Finding the Fourth Proportional to 1,015.72, 1,402.86 and 667.96

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Solution

The fourth proportional to 1,015.72, 1,402.86 and 667.96 is: 922.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.72 : 1,402.86 = 667.96 : x
  2. Step 2: Convert to fraction form
    1,015.72/1,402.86 = 667.96/x
  3. Step 3: Cross multiply
    1,015.72x = 1,402.86 × 667.96
  4. Step 4: Simplify right side
    1,015.72x = 937,054.37
  5. Step 5: Solve for x
    x = 937,054.37/1,015.72
  6. Step 6: Final answer
    x = 922.55

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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.