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Finding the Fourth Proportional to 1,372, 1,893.60 and 820

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Solution

The fourth proportional to 1,372, 1,893.60 and 820 is: 1,131.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372 : 1,893.60 = 820 : x
  2. Step 2: Convert to fraction form
    1,372/1,893.60 = 820/x
  3. Step 3: Cross multiply
    1,372x = 1,893.60 × 820
  4. Step 4: Simplify right side
    1,372x = 1,552,752
  5. Step 5: Solve for x
    x = 1,552,752/1,372
  6. Step 6: Final answer
    x = 1,131.74

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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.