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Finding the Fourth Proportional to 391.44, 583.08 and 372.72

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Solution

The fourth proportional to 391.44, 583.08 and 372.72 is: 555.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.44 : 583.08 = 372.72 : x
  2. Step 2: Convert to fraction form
    391.44/583.08 = 372.72/x
  3. Step 3: Cross multiply
    391.44x = 583.08 × 372.72
  4. Step 4: Simplify right side
    391.44x = 217,325.58
  5. Step 5: Solve for x
    x = 217,325.58/391.44
  6. Step 6: Final answer
    x = 555.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.