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Finding the Fourth Proportional to 388.85, 585.95 and 321.88

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Solution

The fourth proportional to 388.85, 585.95 and 321.88 is: 485.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.85 : 585.95 = 321.88 : x
  2. Step 2: Convert to fraction form
    388.85/585.95 = 321.88/x
  3. Step 3: Cross multiply
    388.85x = 585.95 × 321.88
  4. Step 4: Simplify right side
    388.85x = 188,602.51
  5. Step 5: Solve for x
    x = 188,602.51/388.85
  6. Step 6: Final answer
    x = 485.02

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.