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Finding the Fourth Proportional to 392.40, 541.40 and 237.15

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Solution

The fourth proportional to 392.40, 541.40 and 237.15 is: 327.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.40 : 541.40 = 237.15 : x
  2. Step 2: Convert to fraction form
    392.40/541.40 = 237.15/x
  3. Step 3: Cross multiply
    392.40x = 541.40 × 237.15
  4. Step 4: Simplify right side
    392.40x = 128,393.85
  5. Step 5: Solve for x
    x = 128,393.85/392.40
  6. Step 6: Final answer
    x = 327.20

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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.