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Finding the Fourth Proportional to 1,371.76, 1,892.28 and 812.08

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Solution

The fourth proportional to 1,371.76, 1,892.28 and 812.08 is: 1,120.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.76 : 1,892.28 = 812.08 : x
  2. Step 2: Convert to fraction form
    1,371.76/1,892.28 = 812.08/x
  3. Step 3: Cross multiply
    1,371.76x = 1,892.28 × 812.08
  4. Step 4: Simplify right side
    1,371.76x = 1,536,682.74
  5. Step 5: Solve for x
    x = 1,536,682.74/1,371.76
  6. Step 6: Final answer
    x = 1,120.23

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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.