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Finding the Fourth Proportional to 1,099.36, 1,649.65 and 612.75

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Solution

The fourth proportional to 1,099.36, 1,649.65 and 612.75 is: 919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.36 : 1,649.65 = 612.75 : x
  2. Step 2: Convert to fraction form
    1,099.36/1,649.65 = 612.75/x
  3. Step 3: Cross multiply
    1,099.36x = 1,649.65 × 612.75
  4. Step 4: Simplify right side
    1,099.36x = 1,010,823.04
  5. Step 5: Solve for x
    x = 1,010,823.04/1,099.36
  6. Step 6: Final answer
    x = 919.46

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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.