Home / 1,220.79-1,831.31-490.28

Finding the Fourth Proportional to 1,220.79, 1,831.31 and 490.28

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Solution

The fourth proportional to 1,220.79, 1,831.31 and 490.28 is: 735.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.79 : 1,831.31 = 490.28 : x
  2. Step 2: Convert to fraction form
    1,220.79/1,831.31 = 490.28/x
  3. Step 3: Cross multiply
    1,220.79x = 1,831.31 × 490.28
  4. Step 4: Simplify right side
    1,220.79x = 897,843.06
  5. Step 5: Solve for x
    x = 897,843.06/1,220.79
  6. Step 6: Final answer
    x = 735.46

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1.5x scale

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.