Home / 1,398.58-2,100.30-1,284.64

Finding the Fourth Proportional to 1,398.58, 2,100.30 and 1,284.64

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Solution

The fourth proportional to 1,398.58, 2,100.30 and 1,284.64 is: 1,929.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.58 : 2,100.30 = 1,284.64 : x
  2. Step 2: Convert to fraction form
    1,398.58/2,100.30 = 1,284.64/x
  3. Step 3: Cross multiply
    1,398.58x = 2,100.30 × 1,284.64
  4. Step 4: Simplify right side
    1,398.58x = 2,698,129.39
  5. Step 5: Solve for x
    x = 2,698,129.39/1,398.58
  6. Step 6: Final answer
    x = 1,929.19

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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.