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Finding the Fourth Proportional to 1,941.36, 2,911.95 and 642.75

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Solution

The fourth proportional to 1,941.36, 2,911.95 and 642.75 is: 964.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,941.36 : 2,911.95 = 642.75 : x
  2. Step 2: Convert to fraction form
    1,941.36/2,911.95 = 642.75/x
  3. Step 3: Cross multiply
    1,941.36x = 2,911.95 × 642.75
  4. Step 4: Simplify right side
    1,941.36x = 1,871,655.86
  5. Step 5: Solve for x
    x = 1,871,655.86/1,941.36
  6. Step 6: Final answer
    x = 964.10

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1.5x scale

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.