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Finding the Fourth Proportional to 1,959.94, 2,938.74 and 661.24

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Solution

The fourth proportional to 1,959.94, 2,938.74 and 661.24 is: 991.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,959.94 : 2,938.74 = 661.24 : x
  2. Step 2: Convert to fraction form
    1,959.94/2,938.74 = 661.24/x
  3. Step 3: Cross multiply
    1,959.94x = 2,938.74 × 661.24
  4. Step 4: Simplify right side
    1,959.94x = 1,943,212.44
  5. Step 5: Solve for x
    x = 1,943,212.44/1,959.94
  6. Step 6: Final answer
    x = 991.47

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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.