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Finding the Fourth Proportional to 933.80, 1,289.70 and 810.60

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Solution

The fourth proportional to 933.80, 1,289.70 and 810.60 is: 1,119.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.80 : 1,289.70 = 810.60 : x
  2. Step 2: Convert to fraction form
    933.80/1,289.70 = 810.60/x
  3. Step 3: Cross multiply
    933.80x = 1,289.70 × 810.60
  4. Step 4: Simplify right side
    933.80x = 1,045,430.82
  5. Step 5: Solve for x
    x = 1,045,430.82/933.80
  6. Step 6: Final answer
    x = 1,119.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.