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Finding the Fourth Proportional to 1,231.83, 1,699.74 and 707.76

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Solution

The fourth proportional to 1,231.83, 1,699.74 and 707.76 is: 976.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.83 : 1,699.74 = 707.76 : x
  2. Step 2: Convert to fraction form
    1,231.83/1,699.74 = 707.76/x
  3. Step 3: Cross multiply
    1,231.83x = 1,699.74 × 707.76
  4. Step 4: Simplify right side
    1,231.83x = 1,203,007.98
  5. Step 5: Solve for x
    x = 1,203,007.98/1,231.83
  6. Step 6: Final answer
    x = 976.60

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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.