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Finding the Fourth Proportional to 388.70, 583.05 and 172.43

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Solution

The fourth proportional to 388.70, 583.05 and 172.43 is: 258.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.70 : 583.05 = 172.43 : x
  2. Step 2: Convert to fraction form
    388.70/583.05 = 172.43/x
  3. Step 3: Cross multiply
    388.70x = 583.05 × 172.43
  4. Step 4: Simplify right side
    388.70x = 100,534.26
  5. Step 5: Solve for x
    x = 100,534.26/388.70
  6. Step 6: Final answer
    x = 258.64

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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.