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Finding the Fourth Proportional to 1,127.96, 1,692.01 and 640.07

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Solution

The fourth proportional to 1,127.96, 1,692.01 and 640.07 is: 960.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,127.96 : 1,692.01 = 640.07 : x
  2. Step 2: Convert to fraction form
    1,127.96/1,692.01 = 640.07/x
  3. Step 3: Cross multiply
    1,127.96x = 1,692.01 × 640.07
  4. Step 4: Simplify right side
    1,127.96x = 1,083,004.84
  5. Step 5: Solve for x
    x = 1,083,004.84/1,127.96
  6. Step 6: Final answer
    x = 960.14

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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.