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Finding the Fourth Proportional to 1,022.28, 1,409.85 and 672.90

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Solution

The fourth proportional to 1,022.28, 1,409.85 and 672.90 is: 928.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,022.28 : 1,409.85 = 672.90 : x
  2. Step 2: Convert to fraction form
    1,022.28/1,409.85 = 672.90/x
  3. Step 3: Cross multiply
    1,022.28x = 1,409.85 × 672.90
  4. Step 4: Simplify right side
    1,022.28x = 948,688.07
  5. Step 5: Solve for x
    x = 948,688.07/1,022.28
  6. Step 6: Final answer
    x = 928.01

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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.