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Finding the Fourth Proportional to 533.87, 800.40 and 385.70

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Solution

The fourth proportional to 533.87, 800.40 and 385.70 is: 578.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    533.87 : 800.40 = 385.70 : x
  2. Step 2: Convert to fraction form
    533.87/800.40 = 385.70/x
  3. Step 3: Cross multiply
    533.87x = 800.40 × 385.70
  4. Step 4: Simplify right side
    533.87x = 308,710.28
  5. Step 5: Solve for x
    x = 308,710.28/533.87
  6. Step 6: Final answer
    x = 578.26

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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.