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Finding the Fourth Proportional to 1,239.36, 1,710.21 and 679.81

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Solution

The fourth proportional to 1,239.36, 1,710.21 and 679.81 is: 938.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.36 : 1,710.21 = 679.81 : x
  2. Step 2: Convert to fraction form
    1,239.36/1,710.21 = 679.81/x
  3. Step 3: Cross multiply
    1,239.36x = 1,710.21 × 679.81
  4. Step 4: Simplify right side
    1,239.36x = 1,162,617.86
  5. Step 5: Solve for x
    x = 1,162,617.86/1,239.36
  6. Step 6: Final answer
    x = 938.08

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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.