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Finding the Fourth Proportional to 804.68, 1,206.60 and 393.89

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Solution

The fourth proportional to 804.68, 1,206.60 and 393.89 is: 590.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.68 : 1,206.60 = 393.89 : x
  2. Step 2: Convert to fraction form
    804.68/1,206.60 = 393.89/x
  3. Step 3: Cross multiply
    804.68x = 1,206.60 × 393.89
  4. Step 4: Simplify right side
    804.68x = 475,267.67
  5. Step 5: Solve for x
    x = 475,267.67/804.68
  6. Step 6: Final answer
    x = 590.63

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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.