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Finding the Fourth Proportional to 790.40, 1,185.74 and 327.93

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Solution

The fourth proportional to 790.40, 1,185.74 and 327.93 is: 491.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    790.40 : 1,185.74 = 327.93 : x
  2. Step 2: Convert to fraction form
    790.40/1,185.74 = 327.93/x
  3. Step 3: Cross multiply
    790.40x = 1,185.74 × 327.93
  4. Step 4: Simplify right side
    790.40x = 388,838.08
  5. Step 5: Solve for x
    x = 388,838.08/790.40
  6. Step 6: Final answer
    x = 491.95

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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.