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Finding the Fourth Proportional to 804.87, 1,206.69 and 642.46

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Solution

The fourth proportional to 804.87, 1,206.69 and 642.46 is: 963.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.87 : 1,206.69 = 642.46 : x
  2. Step 2: Convert to fraction form
    804.87/1,206.69 = 642.46/x
  3. Step 3: Cross multiply
    804.87x = 1,206.69 × 642.46
  4. Step 4: Simplify right side
    804.87x = 775,250.06
  5. Step 5: Solve for x
    x = 775,250.06/804.87
  6. Step 6: Final answer
    x = 963.20

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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.