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Finding the Fourth Proportional to 395.07, 588.28 and 390.72

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Solution

The fourth proportional to 395.07, 588.28 and 390.72 is: 581.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.07 : 588.28 = 390.72 : x
  2. Step 2: Convert to fraction form
    395.07/588.28 = 390.72/x
  3. Step 3: Cross multiply
    395.07x = 588.28 × 390.72
  4. Step 4: Simplify right side
    395.07x = 229,852.76
  5. Step 5: Solve for x
    x = 229,852.76/395.07
  6. Step 6: Final answer
    x = 581.80

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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.