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Finding the Fourth Proportional to 2,818.64, 3,890.20 and 1,640.39

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Solution

The fourth proportional to 2,818.64, 3,890.20 and 1,640.39 is: 2,264.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,818.64 : 3,890.20 = 1,640.39 : x
  2. Step 2: Convert to fraction form
    2,818.64/3,890.20 = 1,640.39/x
  3. Step 3: Cross multiply
    2,818.64x = 3,890.20 × 1,640.39
  4. Step 4: Simplify right side
    2,818.64x = 6,381,445.18
  5. Step 5: Solve for x
    x = 6,381,445.18/2,818.64
  6. Step 6: Final answer
    x = 2,264.02

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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.