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Finding the Fourth Proportional to 798.94, 1,197.90 and 271.78

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Solution

The fourth proportional to 798.94, 1,197.90 and 271.78 is: 407.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    798.94 : 1,197.90 = 271.78 : x
  2. Step 2: Convert to fraction form
    798.94/1,197.90 = 271.78/x
  3. Step 3: Cross multiply
    798.94x = 1,197.90 × 271.78
  4. Step 4: Simplify right side
    798.94x = 325,565.26
  5. Step 5: Solve for x
    x = 325,565.26/798.94
  6. Step 6: Final answer
    x = 407.50

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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.