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Finding the Fourth Proportional to 1,099.35, 1,645.88 and 840.45

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Solution

The fourth proportional to 1,099.35, 1,645.88 and 840.45 is: 1,258.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.35 : 1,645.88 = 840.45 : x
  2. Step 2: Convert to fraction form
    1,099.35/1,645.88 = 840.45/x
  3. Step 3: Cross multiply
    1,099.35x = 1,645.88 × 840.45
  4. Step 4: Simplify right side
    1,099.35x = 1,383,275.64
  5. Step 5: Solve for x
    x = 1,383,275.64/1,099.35
  6. Step 6: Final answer
    x = 1,258.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.