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Finding the Fourth Proportional to 1,920.10, 2,649.64 and 1,080.94

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Solution

The fourth proportional to 1,920.10, 2,649.64 and 1,080.94 is: 1,491.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,920.10 : 2,649.64 = 1,080.94 : x
  2. Step 2: Convert to fraction form
    1,920.10/2,649.64 = 1,080.94/x
  3. Step 3: Cross multiply
    1,920.10x = 2,649.64 × 1,080.94
  4. Step 4: Simplify right side
    1,920.10x = 2,864,101.86
  5. Step 5: Solve for x
    x = 2,864,101.86/1,920.10
  6. Step 6: Final answer
    x = 1,491.64

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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.