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Finding the Fourth Proportional to 1,231.80, 1,699.88 and 708.00

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Solution

The fourth proportional to 1,231.80, 1,699.88 and 708.00 is: 977.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.80 : 1,699.88 = 708.00 : x
  2. Step 2: Convert to fraction form
    1,231.80/1,699.88 = 708.00/x
  3. Step 3: Cross multiply
    1,231.80x = 1,699.88 × 708.00
  4. Step 4: Simplify right side
    1,231.80x = 1,203,503.00
  5. Step 5: Solve for x
    x = 1,203,503.00/1,231.80
  6. Step 6: Final answer
    x = 977.03

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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.