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Finding the Fourth Proportional to 1,000.77, 1,380.72 and 669.09

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Solution

The fourth proportional to 1,000.77, 1,380.72 and 669.09 is: 923.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.77 : 1,380.72 = 669.09 : x
  2. Step 2: Convert to fraction form
    1,000.77/1,380.72 = 669.09/x
  3. Step 3: Cross multiply
    1,000.77x = 1,380.72 × 669.09
  4. Step 4: Simplify right side
    1,000.77x = 923,825.94
  5. Step 5: Solve for x
    x = 923,825.94/1,000.77
  6. Step 6: Final answer
    x = 923.12

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1.5x scale

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.