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Finding the Fourth Proportional to 1,280.73, 1,768.51 and 809.45

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Solution

The fourth proportional to 1,280.73, 1,768.51 and 809.45 is: 1,117.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.73 : 1,768.51 = 809.45 : x
  2. Step 2: Convert to fraction form
    1,280.73/1,768.51 = 809.45/x
  3. Step 3: Cross multiply
    1,280.73x = 1,768.51 × 809.45
  4. Step 4: Simplify right side
    1,280.73x = 1,431,520.42
  5. Step 5: Solve for x
    x = 1,431,520.42/1,280.73
  6. Step 6: Final answer
    x = 1,117.74

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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.