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Finding the Fourth Proportional to 921.02, 1,379.59 and 725.09

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Solution

The fourth proportional to 921.02, 1,379.59 and 725.09 is: 1,086.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.02 : 1,379.59 = 725.09 : x
  2. Step 2: Convert to fraction form
    921.02/1,379.59 = 725.09/x
  3. Step 3: Cross multiply
    921.02x = 1,379.59 × 725.09
  4. Step 4: Simplify right side
    921.02x = 1,000,328.55
  5. Step 5: Solve for x
    x = 1,000,328.55/921.02
  6. Step 6: Final answer
    x = 1,086.11

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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.