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Finding the Fourth Proportional to 388.86, 583.28 and 145.37

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Solution

The fourth proportional to 388.86, 583.28 and 145.37 is: 218.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.86 : 583.28 = 145.37 : x
  2. Step 2: Convert to fraction form
    388.86/583.28 = 145.37/x
  3. Step 3: Cross multiply
    388.86x = 583.28 × 145.37
  4. Step 4: Simplify right side
    388.86x = 84,791.05
  5. Step 5: Solve for x
    x = 84,791.05/388.86
  6. Step 6: Final answer
    x = 218.05

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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.