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Finding the Fourth Proportional to 1,636.74, 2,258.64 and 890.69

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Solution

The fourth proportional to 1,636.74, 2,258.64 and 890.69 is: 1,229.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,636.74 : 2,258.64 = 890.69 : x
  2. Step 2: Convert to fraction form
    1,636.74/2,258.64 = 890.69/x
  3. Step 3: Cross multiply
    1,636.74x = 2,258.64 × 890.69
  4. Step 4: Simplify right side
    1,636.74x = 2,011,736.77
  5. Step 5: Solve for x
    x = 2,011,736.77/1,636.74
  6. Step 6: Final answer
    x = 1,229.11

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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.