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Finding the Fourth Proportional to 1,341.12, 2,007 and 820.89

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Solution

The fourth proportional to 1,341.12, 2,007 and 820.89 is: 1,228.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,341.12 : 2,007 = 820.89 : x
  2. Step 2: Convert to fraction form
    1,341.12/2,007 = 820.89/x
  3. Step 3: Cross multiply
    1,341.12x = 2,007 × 820.89
  4. Step 4: Simplify right side
    1,341.12x = 1,647,526.23
  5. Step 5: Solve for x
    x = 1,647,526.23/1,341.12
  6. Step 6: Final answer
    x = 1,228.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.