Home / 1,421.16-2,126.88-1,388.76

Finding the Fourth Proportional to 1,421.16, 2,126.88 and 1,388.76

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Solution

The fourth proportional to 1,421.16, 2,126.88 and 1,388.76 is: 2,078.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.16 : 2,126.88 = 1,388.76 : x
  2. Step 2: Convert to fraction form
    1,421.16/2,126.88 = 1,388.76/x
  3. Step 3: Cross multiply
    1,421.16x = 2,126.88 × 1,388.76
  4. Step 4: Simplify right side
    1,421.16x = 2,953,725.87
  5. Step 5: Solve for x
    x = 2,953,725.87/1,421.16
  6. Step 6: Final answer
    x = 2,078.39

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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.