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Finding the Fourth Proportional to 1,231.91, 1,699.60 and 790.05

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Solution

The fourth proportional to 1,231.91, 1,699.60 and 790.05 is: 1,089.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.91 : 1,699.60 = 790.05 : x
  2. Step 2: Convert to fraction form
    1,231.91/1,699.60 = 790.05/x
  3. Step 3: Cross multiply
    1,231.91x = 1,699.60 × 790.05
  4. Step 4: Simplify right side
    1,231.91x = 1,342,768.98
  5. Step 5: Solve for x
    x = 1,342,768.98/1,231.91
  6. Step 6: Final answer
    x = 1,089.99

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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.