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Finding the Fourth Proportional to 1,231.60, 1,699.78 and 707.54

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Solution

The fourth proportional to 1,231.60, 1,699.78 and 707.54 is: 976.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.60 : 1,699.78 = 707.54 : x
  2. Step 2: Convert to fraction form
    1,231.60/1,699.78 = 707.54/x
  3. Step 3: Cross multiply
    1,231.60x = 1,699.78 × 707.54
  4. Step 4: Simplify right side
    1,231.60x = 1,202,662.34
  5. Step 5: Solve for x
    x = 1,202,662.34/1,231.60
  6. Step 6: Final answer
    x = 976.50

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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.