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Finding the Fourth Proportional to 392.98, 585.02 and 390.94

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Solution

The fourth proportional to 392.98, 585.02 and 390.94 is: 581.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.98 : 585.02 = 390.94 : x
  2. Step 2: Convert to fraction form
    392.98/585.02 = 390.94/x
  3. Step 3: Cross multiply
    392.98x = 585.02 × 390.94
  4. Step 4: Simplify right side
    392.98x = 228,702.84
  5. Step 5: Solve for x
    x = 228,702.84/392.98
  6. Step 6: Final answer
    x = 581.98

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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.