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Finding the Fourth Proportional to 1,941.60, 2,912.86 and 643.08

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Solution

The fourth proportional to 1,941.60, 2,912.86 and 643.08 is: 964.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,941.60 : 2,912.86 = 643.08 : x
  2. Step 2: Convert to fraction form
    1,941.60/2,912.86 = 643.08/x
  3. Step 3: Cross multiply
    1,941.60x = 2,912.86 × 643.08
  4. Step 4: Simplify right side
    1,941.60x = 1,873,202.01
  5. Step 5: Solve for x
    x = 1,873,202.01/1,941.60
  6. Step 6: Final answer
    x = 964.77

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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.