Home / 1,420.36-2,129.40-679.58

Finding the Fourth Proportional to 1,420.36, 2,129.40 and 679.58

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Solution

The fourth proportional to 1,420.36, 2,129.40 and 679.58 is: 1,018.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.36 : 2,129.40 = 679.58 : x
  2. Step 2: Convert to fraction form
    1,420.36/2,129.40 = 679.58/x
  3. Step 3: Cross multiply
    1,420.36x = 2,129.40 × 679.58
  4. Step 4: Simplify right side
    1,420.36x = 1,447,097.65
  5. Step 5: Solve for x
    x = 1,447,097.65/1,420.36
  6. Step 6: Final answer
    x = 1,018.83

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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.