Home / 1,942.10-2,912.20-643.13

Finding the Fourth Proportional to 1,942.10, 2,912.20 and 643.13

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Solution

The fourth proportional to 1,942.10, 2,912.20 and 643.13 is: 964.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.10 : 2,912.20 = 643.13 : x
  2. Step 2: Convert to fraction form
    1,942.10/2,912.20 = 643.13/x
  3. Step 3: Cross multiply
    1,942.10x = 2,912.20 × 643.13
  4. Step 4: Simplify right side
    1,942.10x = 1,872,907.02
  5. Step 5: Solve for x
    x = 1,872,907.02/1,942.10
  6. Step 6: Final answer
    x = 964.37

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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.