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Finding the Fourth Proportional to 933.69, 1,399.82 and 805.20

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Solution

The fourth proportional to 933.69, 1,399.82 and 805.20 is: 1,207.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.69 : 1,399.82 = 805.20 : x
  2. Step 2: Convert to fraction form
    933.69/1,399.82 = 805.20/x
  3. Step 3: Cross multiply
    933.69x = 1,399.82 × 805.20
  4. Step 4: Simplify right side
    933.69x = 1,127,135.06
  5. Step 5: Solve for x
    x = 1,127,135.06/933.69
  6. Step 6: Final answer
    x = 1,207.18

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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.