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Finding the Fourth Proportional to 1,099.63, 1,649.75 and 978.74

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Solution

The fourth proportional to 1,099.63, 1,649.75 and 978.74 is: 1,468.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.63 : 1,649.75 = 978.74 : x
  2. Step 2: Convert to fraction form
    1,099.63/1,649.75 = 978.74/x
  3. Step 3: Cross multiply
    1,099.63x = 1,649.75 × 978.74
  4. Step 4: Simplify right side
    1,099.63x = 1,614,676.32
  5. Step 5: Solve for x
    x = 1,614,676.32/1,099.63
  6. Step 6: Final answer
    x = 1,468.38

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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.