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Finding the Fourth Proportional to 806.60, 1,208.10 and 623.40

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Solution

The fourth proportional to 806.60, 1,208.10 and 623.40 is: 933.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.60 : 1,208.10 = 623.40 : x
  2. Step 2: Convert to fraction form
    806.60/1,208.10 = 623.40/x
  3. Step 3: Cross multiply
    806.60x = 1,208.10 × 623.40
  4. Step 4: Simplify right side
    806.60x = 753,129.54
  5. Step 5: Solve for x
    x = 753,129.54/806.60
  6. Step 6: Final answer
    x = 933.71

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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.