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Finding the Fourth Proportional to 1,941.45, 2,912.37 and 643.02

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Solution

The fourth proportional to 1,941.45, 2,912.37 and 643.02 is: 964.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,941.45 : 2,912.37 = 643.02 : x
  2. Step 2: Convert to fraction form
    1,941.45/2,912.37 = 643.02/x
  3. Step 3: Cross multiply
    1,941.45x = 2,912.37 × 643.02
  4. Step 4: Simplify right side
    1,941.45x = 1,872,712.16
  5. Step 5: Solve for x
    x = 1,872,712.16/1,941.45
  6. Step 6: Final answer
    x = 964.59

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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.