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Finding the Fourth Proportional to 1,392.09, 1,920.27 and 824.73

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Solution

The fourth proportional to 1,392.09, 1,920.27 and 824.73 is: 1,137.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.09 : 1,920.27 = 824.73 : x
  2. Step 2: Convert to fraction form
    1,392.09/1,920.27 = 824.73/x
  3. Step 3: Cross multiply
    1,392.09x = 1,920.27 × 824.73
  4. Step 4: Simplify right side
    1,392.09x = 1,583,693.21
  5. Step 5: Solve for x
    x = 1,583,693.21/1,392.09
  6. Step 6: Final answer
    x = 1,137.64

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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.