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Finding the Fourth Proportional to 388.71, 583.09 and 145.22

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Solution

The fourth proportional to 388.71, 583.09 and 145.22 is: 217.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.71 : 583.09 = 145.22 : x
  2. Step 2: Convert to fraction form
    388.71/583.09 = 145.22/x
  3. Step 3: Cross multiply
    388.71x = 583.09 × 145.22
  4. Step 4: Simplify right side
    388.71x = 84,673.05
  5. Step 5: Solve for x
    x = 84,673.05/388.71
  6. Step 6: Final answer
    x = 217.83

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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.