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Finding the Fourth Proportional to 1,220.76, 1,831.44 and 441

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Solution

The fourth proportional to 1,220.76, 1,831.44 and 441 is: 661.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.76 : 1,831.44 = 441 : x
  2. Step 2: Convert to fraction form
    1,220.76/1,831.44 = 441/x
  3. Step 3: Cross multiply
    1,220.76x = 1,831.44 × 441
  4. Step 4: Simplify right side
    1,220.76x = 807,665.04
  5. Step 5: Solve for x
    x = 807,665.04/1,220.76
  6. Step 6: Final answer
    x = 661.61

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Half scale
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Double scale
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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.