Home / 1,425.80-2,138.70-1,316.45

Finding the Fourth Proportional to 1,425.80, 2,138.70 and 1,316.45

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Solution

The fourth proportional to 1,425.80, 2,138.70 and 1,316.45 is: 1,974.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.80 : 2,138.70 = 1,316.45 : x
  2. Step 2: Convert to fraction form
    1,425.80/2,138.70 = 1,316.45/x
  3. Step 3: Cross multiply
    1,425.80x = 2,138.70 × 1,316.45
  4. Step 4: Simplify right side
    1,425.80x = 2,815,491.62
  5. Step 5: Solve for x
    x = 2,815,491.62/1,425.80
  6. Step 6: Final answer
    x = 1,974.68

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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.