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Finding the Fourth Proportional to 1,369.34, 1,889.36 and 809.77

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Solution

The fourth proportional to 1,369.34, 1,889.36 and 809.77 is: 1,117.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.34 : 1,889.36 = 809.77 : x
  2. Step 2: Convert to fraction form
    1,369.34/1,889.36 = 809.77/x
  3. Step 3: Cross multiply
    1,369.34x = 1,889.36 × 809.77
  4. Step 4: Simplify right side
    1,369.34x = 1,529,947.05
  5. Step 5: Solve for x
    x = 1,529,947.05/1,369.34
  6. Step 6: Final answer
    x = 1,117.29

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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.