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Finding the Fourth Proportional to 1,000.74, 1,379.36 and 669.04

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Solution

The fourth proportional to 1,000.74, 1,379.36 and 669.04 is: 922.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.74 : 1,379.36 = 669.04 : x
  2. Step 2: Convert to fraction form
    1,000.74/1,379.36 = 669.04/x
  3. Step 3: Cross multiply
    1,000.74x = 1,379.36 × 669.04
  4. Step 4: Simplify right side
    1,000.74x = 922,847.01
  5. Step 5: Solve for x
    x = 922,847.01/1,000.74
  6. Step 6: Final answer
    x = 922.16

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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.