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Finding the Fourth Proportional to 785.22, 1,177.71 and 394.80

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Solution

The fourth proportional to 785.22, 1,177.71 and 394.80 is: 592.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.22 : 1,177.71 = 394.80 : x
  2. Step 2: Convert to fraction form
    785.22/1,177.71 = 394.80/x
  3. Step 3: Cross multiply
    785.22x = 1,177.71 × 394.80
  4. Step 4: Simplify right side
    785.22x = 464,959.91
  5. Step 5: Solve for x
    x = 464,959.91/785.22
  6. Step 6: Final answer
    x = 592.14

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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.