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Finding the Fourth Proportional to 1,959.99, 2,940.16 and 643.35

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Solution

The fourth proportional to 1,959.99, 2,940.16 and 643.35 is: 965.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.99 : 2,940.16 = 643.35 : x
  2. Step 2: Convert to fraction form
    1,959.99/2,940.16 = 643.35/x
  3. Step 3: Cross multiply
    1,959.99x = 2,940.16 × 643.35
  4. Step 4: Simplify right side
    1,959.99x = 1,891,548.72
  5. Step 5: Solve for x
    x = 1,891,548.72/1,959.99
  6. Step 6: Final answer
    x = 965.08

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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.