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Finding the Fourth Proportional to 388.89, 582.62 and 215.30

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Solution

The fourth proportional to 388.89, 582.62 and 215.30 is: 322.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.89 : 582.62 = 215.30 : x
  2. Step 2: Convert to fraction form
    388.89/582.62 = 215.30/x
  3. Step 3: Cross multiply
    388.89x = 582.62 × 215.30
  4. Step 4: Simplify right side
    388.89x = 125,434.10
  5. Step 5: Solve for x
    x = 125,434.10/388.89
  6. Step 6: Final answer
    x = 322.54

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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.