Home / 1,220.55-1,831.34-489.95

Finding the Fourth Proportional to 1,220.55, 1,831.34 and 489.95

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Solution

The fourth proportional to 1,220.55, 1,831.34 and 489.95 is: 735.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.55 : 1,831.34 = 489.95 : x
  2. Step 2: Convert to fraction form
    1,220.55/1,831.34 = 489.95/x
  3. Step 3: Cross multiply
    1,220.55x = 1,831.34 × 489.95
  4. Step 4: Simplify right side
    1,220.55x = 897,265.03
  5. Step 5: Solve for x
    x = 897,265.03/1,220.55
  6. Step 6: Final answer
    x = 735.13

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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.