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Finding the Fourth Proportional to 1,231.12, 1,698.92 and 707.12

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Solution

The fourth proportional to 1,231.12, 1,698.92 and 707.12 is: 975.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.12 : 1,698.92 = 707.12 : x
  2. Step 2: Convert to fraction form
    1,231.12/1,698.92 = 707.12/x
  3. Step 3: Cross multiply
    1,231.12x = 1,698.92 × 707.12
  4. Step 4: Simplify right side
    1,231.12x = 1,201,340.31
  5. Step 5: Solve for x
    x = 1,201,340.31/1,231.12
  6. Step 6: Final answer
    x = 975.81

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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.