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Finding the Fourth Proportional to 1,941.28, 2,911.98 and 642.75

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Solution

The fourth proportional to 1,941.28, 2,911.98 and 642.75 is: 964.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,941.28 : 2,911.98 = 642.75 : x
  2. Step 2: Convert to fraction form
    1,941.28/2,911.98 = 642.75/x
  3. Step 3: Cross multiply
    1,941.28x = 2,911.98 × 642.75
  4. Step 4: Simplify right side
    1,941.28x = 1,871,675.15
  5. Step 5: Solve for x
    x = 1,871,675.15/1,941.28
  6. Step 6: Final answer
    x = 964.14

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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.