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Finding the Fourth Proportional to 1,369.10, 1,889.28 and 809.60

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Solution

The fourth proportional to 1,369.10, 1,889.28 and 809.60 is: 1,117.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.10 : 1,889.28 = 809.60 : x
  2. Step 2: Convert to fraction form
    1,369.10/1,889.28 = 809.60/x
  3. Step 3: Cross multiply
    1,369.10x = 1,889.28 × 809.60
  4. Step 4: Simplify right side
    1,369.10x = 1,529,551.64
  5. Step 5: Solve for x
    x = 1,529,551.64/1,369.10
  6. Step 6: Final answer
    x = 1,117.20

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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.