Home / 1,390.23-2,085.75-697.41

Finding the Fourth Proportional to 1,390.23, 2,085.75 and 697.41

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Solution

The fourth proportional to 1,390.23, 2,085.75 and 697.41 is: 1,046.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.23 : 2,085.75 = 697.41 : x
  2. Step 2: Convert to fraction form
    1,390.23/2,085.75 = 697.41/x
  3. Step 3: Cross multiply
    1,390.23x = 2,085.75 × 697.41
  4. Step 4: Simplify right side
    1,390.23x = 1,454,622.91
  5. Step 5: Solve for x
    x = 1,454,622.91/1,390.23
  6. Step 6: Final answer
    x = 1,046.32

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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.