Home / 1,942.20-2,913.60-643.26

Finding the Fourth Proportional to 1,942.20, 2,913.60 and 643.26

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Solution

The fourth proportional to 1,942.20, 2,913.60 and 643.26 is: 964.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.20 : 2,913.60 = 643.26 : x
  2. Step 2: Convert to fraction form
    1,942.20/2,913.60 = 643.26/x
  3. Step 3: Cross multiply
    1,942.20x = 2,913.60 × 643.26
  4. Step 4: Simplify right side
    1,942.20x = 1,874,202.34
  5. Step 5: Solve for x
    x = 1,874,202.34/1,942.20
  6. Step 6: Final answer
    x = 964.99

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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.