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Finding the Fourth Proportional to 1,220.09, 1,831.28 and 756.45

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Solution

The fourth proportional to 1,220.09, 1,831.28 and 756.45 is: 1,135.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.09 : 1,831.28 = 756.45 : x
  2. Step 2: Convert to fraction form
    1,220.09/1,831.28 = 756.45/x
  3. Step 3: Cross multiply
    1,220.09x = 1,831.28 × 756.45
  4. Step 4: Simplify right side
    1,220.09x = 1,385,267.97
  5. Step 5: Solve for x
    x = 1,385,267.97/1,220.09
  6. Step 6: Final answer
    x = 1,135.39

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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.