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Finding the Fourth Proportional to 392.94, 586.32 and 390.66

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Solution

The fourth proportional to 392.94, 586.32 and 390.66 is: 582.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.94 : 586.32 = 390.66 : x
  2. Step 2: Convert to fraction form
    392.94/586.32 = 390.66/x
  3. Step 3: Cross multiply
    392.94x = 586.32 × 390.66
  4. Step 4: Simplify right side
    392.94x = 229,051.77
  5. Step 5: Solve for x
    x = 229,051.77/392.94
  6. Step 6: Final answer
    x = 582.92

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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.