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Finding the Fourth Proportional to 1,942.85, 2,913.32 and 643.88

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Solution

The fourth proportional to 1,942.85, 2,913.32 and 643.88 is: 965.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,942.85 : 2,913.32 = 643.88 : x
  2. Step 2: Convert to fraction form
    1,942.85/2,913.32 = 643.88/x
  3. Step 3: Cross multiply
    1,942.85x = 2,913.32 × 643.88
  4. Step 4: Simplify right side
    1,942.85x = 1,875,815.52
  5. Step 5: Solve for x
    x = 1,875,815.52/1,942.85
  6. Step 6: Final answer
    x = 965.50

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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.