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Finding the Fourth Proportional to 2,479.61, 3,419.21 and 1,640.05

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Solution

The fourth proportional to 2,479.61, 3,419.21 and 1,640.05 is: 2,261.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,479.61 : 3,419.21 = 1,640.05 : x
  2. Step 2: Convert to fraction form
    2,479.61/3,419.21 = 1,640.05/x
  3. Step 3: Cross multiply
    2,479.61x = 3,419.21 × 1,640.05
  4. Step 4: Simplify right side
    2,479.61x = 5,607,670.91
  5. Step 5: Solve for x
    x = 5,607,670.91/2,479.61
  6. Step 6: Final answer
    x = 2,261.51

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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.