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Finding the Fourth Proportional to 2,349.95, 3,239.64 and 1,640.78

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Solution

The fourth proportional to 2,349.95, 3,239.64 and 1,640.78 is: 2,261.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,349.95 : 3,239.64 = 1,640.78 : x
  2. Step 2: Convert to fraction form
    2,349.95/3,239.64 = 1,640.78/x
  3. Step 3: Cross multiply
    2,349.95x = 3,239.64 × 1,640.78
  4. Step 4: Simplify right side
    2,349.95x = 5,315,536.52
  5. Step 5: Solve for x
    x = 5,315,536.52/2,349.95
  6. Step 6: Final answer
    x = 2,261.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.