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Finding the Fourth Proportional to 533.79, 799.47 and 387.18

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Solution

The fourth proportional to 533.79, 799.47 and 387.18 is: 579.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    533.79 : 799.47 = 387.18 : x
  2. Step 2: Convert to fraction form
    533.79/799.47 = 387.18/x
  3. Step 3: Cross multiply
    533.79x = 799.47 × 387.18
  4. Step 4: Simplify right side
    533.79x = 309,538.79
  5. Step 5: Solve for x
    x = 309,538.79/533.79
  6. Step 6: Final answer
    x = 579.89

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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.