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Finding the Fourth Proportional to 804.89, 1,205.47 and 686.47

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Solution

The fourth proportional to 804.89, 1,205.47 and 686.47 is: 1,028.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.89 : 1,205.47 = 686.47 : x
  2. Step 2: Convert to fraction form
    804.89/1,205.47 = 686.47/x
  3. Step 3: Cross multiply
    804.89x = 1,205.47 × 686.47
  4. Step 4: Simplify right side
    804.89x = 827,518.99
  5. Step 5: Solve for x
    x = 827,518.99/804.89
  6. Step 6: Final answer
    x = 1,028.11

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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.