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Finding the Fourth Proportional to 388.37, 582.81 and 215.16

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Solution

The fourth proportional to 388.37, 582.81 and 215.16 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.37 : 582.81 = 215.16 : x
  2. Step 2: Convert to fraction form
    388.37/582.81 = 215.16/x
  3. Step 3: Cross multiply
    388.37x = 582.81 × 215.16
  4. Step 4: Simplify right side
    388.37x = 125,397.40
  5. Step 5: Solve for x
    x = 125,397.40/388.37
  6. Step 6: Final answer
    x = 322.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.