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Finding the Fourth Proportional to 926.97, 1,388.64 and 720.42

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Solution

The fourth proportional to 926.97, 1,388.64 and 720.42 is: 1,079.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.97 : 1,388.64 = 720.42 : x
  2. Step 2: Convert to fraction form
    926.97/1,388.64 = 720.42/x
  3. Step 3: Cross multiply
    926.97x = 1,388.64 × 720.42
  4. Step 4: Simplify right side
    926.97x = 1,000,404.03
  5. Step 5: Solve for x
    x = 1,000,404.03/926.97
  6. Step 6: Final answer
    x = 1,079.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.