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Finding the Fourth Proportional to 392.19, 541.40 and 374.78

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Solution

The fourth proportional to 392.19, 541.40 and 374.78 is: 517.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.19 : 541.40 = 374.78 : x
  2. Step 2: Convert to fraction form
    392.19/541.40 = 374.78/x
  3. Step 3: Cross multiply
    392.19x = 541.40 × 374.78
  4. Step 4: Simplify right side
    392.19x = 202,901.31
  5. Step 5: Solve for x
    x = 202,901.31/392.19
  6. Step 6: Final answer
    x = 517.35

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Double scale
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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.