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Finding the Fourth Proportional to 6,640.88, 9,959 and 1,959.64

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Solution

The fourth proportional to 6,640.88, 9,959 and 1,959.64 is: 2,938.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,640.88 : 9,959 = 1,959.64 : x
  2. Step 2: Convert to fraction form
    6,640.88/9,959 = 1,959.64/x
  3. Step 3: Cross multiply
    6,640.88x = 9,959 × 1,959.64
  4. Step 4: Simplify right side
    6,640.88x = 19,516,054.76
  5. Step 5: Solve for x
    x = 19,516,054.76/6,640.88
  6. Step 6: Final answer
    x = 2,938.78

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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.