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Finding the Fourth Proportional to 392.07, 583.81 and 387.72

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Solution

The fourth proportional to 392.07, 583.81 and 387.72 is: 577.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.07 : 583.81 = 387.72 : x
  2. Step 2: Convert to fraction form
    392.07/583.81 = 387.72/x
  3. Step 3: Cross multiply
    392.07x = 583.81 × 387.72
  4. Step 4: Simplify right side
    392.07x = 226,353.84
  5. Step 5: Solve for x
    x = 226,353.84/392.07
  6. Step 6: Final answer
    x = 577.33

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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.