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Finding the Fourth Proportional to 2,815.78, 3,886.01 and 1,636.78

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Solution

The fourth proportional to 2,815.78, 3,886.01 and 1,636.78 is: 2,258.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.78 : 3,886.01 = 1,636.78 : x
  2. Step 2: Convert to fraction form
    2,815.78/3,886.01 = 1,636.78/x
  3. Step 3: Cross multiply
    2,815.78x = 3,886.01 × 1,636.78
  4. Step 4: Simplify right side
    2,815.78x = 6,360,543.45
  5. Step 5: Solve for x
    x = 6,360,543.45/2,815.78
  6. Step 6: Final answer
    x = 2,258.89

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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.