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Finding the Fourth Proportional to 933.88, 1,285.92 and 809.55

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Solution

The fourth proportional to 933.88, 1,285.92 and 809.55 is: 1,114.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    933.88 : 1,285.92 = 809.55 : x
  2. Step 2: Convert to fraction form
    933.88/1,285.92 = 809.55/x
  3. Step 3: Cross multiply
    933.88x = 1,285.92 × 809.55
  4. Step 4: Simplify right side
    933.88x = 1,041,016.54
  5. Step 5: Solve for x
    x = 1,041,016.54/933.88
  6. Step 6: Final answer
    x = 1,114.72

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1.5x scale

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.