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Finding the Fourth Proportional to 535.90, 739.38 and 389.56

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Solution

The fourth proportional to 535.90, 739.38 and 389.56 is: 537.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.90 : 739.38 = 389.56 : x
  2. Step 2: Convert to fraction form
    535.90/739.38 = 389.56/x
  3. Step 3: Cross multiply
    535.90x = 739.38 × 389.56
  4. Step 4: Simplify right side
    535.90x = 288,032.87
  5. Step 5: Solve for x
    x = 288,032.87/535.90
  6. Step 6: Final answer
    x = 537.48

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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.