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Finding the Fourth Proportional to 535.40, 739.52 and 387.80

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Solution

The fourth proportional to 535.40, 739.52 and 387.80 is: 535.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    535.40 : 739.52 = 387.80 : x
  2. Step 2: Convert to fraction form
    535.40/739.52 = 387.80/x
  3. Step 3: Cross multiply
    535.40x = 739.52 × 387.80
  4. Step 4: Simplify right side
    535.40x = 286,785.86
  5. Step 5: Solve for x
    x = 286,785.86/535.40
  6. Step 6: Final answer
    x = 535.65

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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.