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Finding the Fourth Proportional to 1,230.78, 1,698.75 and 706.98

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Solution

The fourth proportional to 1,230.78, 1,698.75 and 706.98 is: 975.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,230.78 : 1,698.75 = 706.98 : x
  2. Step 2: Convert to fraction form
    1,230.78/1,698.75 = 706.98/x
  3. Step 3: Cross multiply
    1,230.78x = 1,698.75 × 706.98
  4. Step 4: Simplify right side
    1,230.78x = 1,200,982.28
  5. Step 5: Solve for x
    x = 1,200,982.28/1,230.78
  6. Step 6: Final answer
    x = 975.79

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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.