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Finding the Fourth Proportional to 1,369.76, 1,889.96 and 809.84

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Solution

The fourth proportional to 1,369.76, 1,889.96 and 809.84 is: 1,117.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,369.76 : 1,889.96 = 809.84 : x
  2. Step 2: Convert to fraction form
    1,369.76/1,889.96 = 809.84/x
  3. Step 3: Cross multiply
    1,369.76x = 1,889.96 × 809.84
  4. Step 4: Simplify right side
    1,369.76x = 1,530,565.21
  5. Step 5: Solve for x
    x = 1,530,565.21/1,369.76
  6. Step 6: Final answer
    x = 1,117.40

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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.