Home / 1,390.28-2,085.20-465.62

Finding the Fourth Proportional to 1,390.28, 2,085.20 and 465.62

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Solution

The fourth proportional to 1,390.28, 2,085.20 and 465.62 is: 698.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.28 : 2,085.20 = 465.62 : x
  2. Step 2: Convert to fraction form
    1,390.28/2,085.20 = 465.62/x
  3. Step 3: Cross multiply
    1,390.28x = 2,085.20 × 465.62
  4. Step 4: Simplify right side
    1,390.28x = 970,910.82
  5. Step 5: Solve for x
    x = 970,910.82/1,390.28
  6. Step 6: Final answer
    x = 698.36

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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.