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Finding the Fourth Proportional to 533.40, 734.57 and 385.80

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Solution

The fourth proportional to 533.40, 734.57 and 385.80 is: 531.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    533.40 : 734.57 = 385.80 : x
  2. Step 2: Convert to fraction form
    533.40/734.57 = 385.80/x
  3. Step 3: Cross multiply
    533.40x = 734.57 × 385.80
  4. Step 4: Simplify right side
    533.40x = 283,395.18
  5. Step 5: Solve for x
    x = 283,395.18/533.40
  6. Step 6: Final answer
    x = 531.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.