Home / 1,220.55-1,831.50-1,211.28

Finding the Fourth Proportional to 1,220.55, 1,831.50 and 1,211.28

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Solution

The fourth proportional to 1,220.55, 1,831.50 and 1,211.28 is: 1,817.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.55 : 1,831.50 = 1,211.28 : x
  2. Step 2: Convert to fraction form
    1,220.55/1,831.50 = 1,211.28/x
  3. Step 3: Cross multiply
    1,220.55x = 1,831.50 × 1,211.28
  4. Step 4: Simplify right side
    1,220.55x = 2,218,459.32
  5. Step 5: Solve for x
    x = 2,218,459.32/1,220.55
  6. Step 6: Final answer
    x = 1,817.59

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1.5x scale

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.