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Finding the Fourth Proportional to 1,127.94, 1,690.76 and 639.96

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Solution

The fourth proportional to 1,127.94, 1,690.76 and 639.96 is: 959.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.94 : 1,690.76 = 639.96 : x
  2. Step 2: Convert to fraction form
    1,127.94/1,690.76 = 639.96/x
  3. Step 3: Cross multiply
    1,127.94x = 1,690.76 × 639.96
  4. Step 4: Simplify right side
    1,127.94x = 1,082,015.57
  5. Step 5: Solve for x
    x = 1,082,015.57/1,127.94
  6. Step 6: Final answer
    x = 959.28

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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.