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Finding the Fourth Proportional to 1,268.01, 1,749.90 and 708.66

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Solution

The fourth proportional to 1,268.01, 1,749.90 and 708.66 is: 977.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,268.01 : 1,749.90 = 708.66 : x
  2. Step 2: Convert to fraction form
    1,268.01/1,749.90 = 708.66/x
  3. Step 3: Cross multiply
    1,268.01x = 1,749.90 × 708.66
  4. Step 4: Simplify right side
    1,268.01x = 1,240,084.13
  5. Step 5: Solve for x
    x = 1,240,084.13/1,268.01
  6. Step 6: Final answer
    x = 977.98

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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.