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Finding the Fourth Proportional to 392.80, 541.88 and 282.04

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Solution

The fourth proportional to 392.80, 541.88 and 282.04 is: 389.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.80 : 541.88 = 282.04 : x
  2. Step 2: Convert to fraction form
    392.80/541.88 = 282.04/x
  3. Step 3: Cross multiply
    392.80x = 541.88 × 282.04
  4. Step 4: Simplify right side
    392.80x = 152,831.84
  5. Step 5: Solve for x
    x = 152,831.84/392.80
  6. Step 6: Final answer
    x = 389.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.