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Finding the Fourth Proportional to 1,239.16, 1,710.04 and 679.63

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Solution

The fourth proportional to 1,239.16, 1,710.04 and 679.63 is: 937.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.16 : 1,710.04 = 679.63 : x
  2. Step 2: Convert to fraction form
    1,239.16/1,710.04 = 679.63/x
  3. Step 3: Cross multiply
    1,239.16x = 1,710.04 × 679.63
  4. Step 4: Simplify right side
    1,239.16x = 1,162,194.49
  5. Step 5: Solve for x
    x = 1,162,194.49/1,239.16
  6. Step 6: Final answer
    x = 937.89

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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.