Home / 1,398.63-1,929.78-1,343.28

Finding the Fourth Proportional to 1,398.63, 1,929.78 and 1,343.28

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Solution

The fourth proportional to 1,398.63, 1,929.78 and 1,343.28 is: 1,853.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.63 : 1,929.78 = 1,343.28 : x
  2. Step 2: Convert to fraction form
    1,398.63/1,929.78 = 1,343.28/x
  3. Step 3: Cross multiply
    1,398.63x = 1,929.78 × 1,343.28
  4. Step 4: Simplify right side
    1,398.63x = 2,592,234.88
  5. Step 5: Solve for x
    x = 2,592,234.88/1,398.63
  6. Step 6: Final answer
    x = 1,853.41

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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.