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Finding the Fourth Proportional to 790.94, 1,186.40 and 270.94

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Solution

The fourth proportional to 790.94, 1,186.40 and 270.94 is: 406.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.94 : 1,186.40 = 270.94 : x
  2. Step 2: Convert to fraction form
    790.94/1,186.40 = 270.94/x
  3. Step 3: Cross multiply
    790.94x = 1,186.40 × 270.94
  4. Step 4: Simplify right side
    790.94x = 321,437.96
  5. Step 5: Solve for x
    x = 321,437.96/790.94
  6. Step 6: Final answer
    x = 406.40

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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.