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Finding the Fourth Proportional to 1,405.70, 1,939.97 and 816.22

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Solution

The fourth proportional to 1,405.70, 1,939.97 and 816.22 is: 1,126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.70 : 1,939.97 = 816.22 : x
  2. Step 2: Convert to fraction form
    1,405.70/1,939.97 = 816.22/x
  3. Step 3: Cross multiply
    1,405.70x = 1,939.97 × 816.22
  4. Step 4: Simplify right side
    1,405.70x = 1,583,439.50
  5. Step 5: Solve for x
    x = 1,583,439.50/1,405.70
  6. Step 6: Final answer
    x = 1,126.45

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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.