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Finding the Fourth Proportional to 1,220.90, 1,831.86 and 759.07

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Solution

The fourth proportional to 1,220.90, 1,831.86 and 759.07 is: 1,138.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.90 : 1,831.86 = 759.07 : x
  2. Step 2: Convert to fraction form
    1,220.90/1,831.86 = 759.07/x
  3. Step 3: Cross multiply
    1,220.90x = 1,831.86 × 759.07
  4. Step 4: Simplify right side
    1,220.90x = 1,390,509.24
  5. Step 5: Solve for x
    x = 1,390,509.24/1,220.90
  6. Step 6: Final answer
    x = 1,138.92

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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.