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Finding the Fourth Proportional to 2,818.76, 3,890.29 and 1,640.48

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Solution

The fourth proportional to 2,818.76, 3,890.29 and 1,640.48 is: 2,264.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,818.76 : 3,890.29 = 1,640.48 : x
  2. Step 2: Convert to fraction form
    2,818.76/3,890.29 = 1,640.48/x
  3. Step 3: Cross multiply
    2,818.76x = 3,890.29 × 1,640.48
  4. Step 4: Simplify right side
    2,818.76x = 6,381,923.49
  5. Step 5: Solve for x
    x = 6,381,923.49/2,818.76
  6. Step 6: Final answer
    x = 2,264.09

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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.