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Finding the Fourth Proportional to 2,890.62, 3,989.43 and 1,648.86

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Solution

The fourth proportional to 2,890.62, 3,989.43 and 1,648.86 is: 2,275.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.62 : 3,989.43 = 1,648.86 : x
  2. Step 2: Convert to fraction form
    2,890.62/3,989.43 = 1,648.86/x
  3. Step 3: Cross multiply
    2,890.62x = 3,989.43 × 1,648.86
  4. Step 4: Simplify right side
    2,890.62x = 6,578,011.55
  5. Step 5: Solve for x
    x = 6,578,011.55/2,890.62
  6. Step 6: Final answer
    x = 2,275.64

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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.