Home / 1,221.09-1,831.62-572.28

Finding the Fourth Proportional to 1,221.09, 1,831.62 and 572.28

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Solution

The fourth proportional to 1,221.09, 1,831.62 and 572.28 is: 858.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.09 : 1,831.62 = 572.28 : x
  2. Step 2: Convert to fraction form
    1,221.09/1,831.62 = 572.28/x
  3. Step 3: Cross multiply
    1,221.09x = 1,831.62 × 572.28
  4. Step 4: Simplify right side
    1,221.09x = 1,048,199.49
  5. Step 5: Solve for x
    x = 1,048,199.49/1,221.09
  6. Step 6: Final answer
    x = 858.41

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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.