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Finding the Fourth Proportional to 388.88, 583.58 and 145.60

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Solution

The fourth proportional to 388.88, 583.58 and 145.60 is: 218.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.88 : 583.58 = 145.60 : x
  2. Step 2: Convert to fraction form
    388.88/583.58 = 145.60/x
  3. Step 3: Cross multiply
    388.88x = 583.58 × 145.60
  4. Step 4: Simplify right side
    388.88x = 84,969.25
  5. Step 5: Solve for x
    x = 84,969.25/388.88
  6. Step 6: Final answer
    x = 218.50

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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.