Home / 1,222.40-1,831.78-491.58

Finding the Fourth Proportional to 1,222.40, 1,831.78 and 491.58

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Solution

The fourth proportional to 1,222.40, 1,831.78 and 491.58 is: 736.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,222.40 : 1,831.78 = 491.58 : x
  2. Step 2: Convert to fraction form
    1,222.40/1,831.78 = 491.58/x
  3. Step 3: Cross multiply
    1,222.40x = 1,831.78 × 491.58
  4. Step 4: Simplify right side
    1,222.40x = 900,467.03
  5. Step 5: Solve for x
    x = 900,467.03/1,222.40
  6. Step 6: Final answer
    x = 736.64

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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.