Home / 1,418.58-2,128.05-869.94

Finding the Fourth Proportional to 1,418.58, 2,128.05 and 869.94

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Solution

The fourth proportional to 1,418.58, 2,128.05 and 869.94 is: 1,305.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.58 : 2,128.05 = 869.94 : x
  2. Step 2: Convert to fraction form
    1,418.58/2,128.05 = 869.94/x
  3. Step 3: Cross multiply
    1,418.58x = 2,128.05 × 869.94
  4. Step 4: Simplify right side
    1,418.58x = 1,851,275.82
  5. Step 5: Solve for x
    x = 1,851,275.82/1,418.58
  6. Step 6: Final answer
    x = 1,305.02

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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.