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Finding the Fourth Proportional to 1,021.46, 1,409.55 and 672.62

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Solution

The fourth proportional to 1,021.46, 1,409.55 and 672.62 is: 928.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.46 : 1,409.55 = 672.62 : x
  2. Step 2: Convert to fraction form
    1,021.46/1,409.55 = 672.62/x
  3. Step 3: Cross multiply
    1,021.46x = 1,409.55 × 672.62
  4. Step 4: Simplify right side
    1,021.46x = 948,091.52
  5. Step 5: Solve for x
    x = 948,091.52/1,021.46
  6. Step 6: Final answer
    x = 928.17

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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.