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Finding the Fourth Proportional to 1,271.97, 1,911.13 and 809.93

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Solution

The fourth proportional to 1,271.97, 1,911.13 and 809.93 is: 1,216.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.97 : 1,911.13 = 809.93 : x
  2. Step 2: Convert to fraction form
    1,271.97/1,911.13 = 809.93/x
  3. Step 3: Cross multiply
    1,271.97x = 1,911.13 × 809.93
  4. Step 4: Simplify right side
    1,271.97x = 1,547,884.27
  5. Step 5: Solve for x
    x = 1,547,884.27/1,271.97
  6. Step 6: Final answer
    x = 1,216.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.