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Finding the Fourth Proportional to 1,239.01, 1,709.86 and 679.50

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Solution

The fourth proportional to 1,239.01, 1,709.86 and 679.50 is: 937.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.01 : 1,709.86 = 679.50 : x
  2. Step 2: Convert to fraction form
    1,239.01/1,709.86 = 679.50/x
  3. Step 3: Cross multiply
    1,239.01x = 1,709.86 × 679.50
  4. Step 4: Simplify right side
    1,239.01x = 1,161,846.47
  5. Step 5: Solve for x
    x = 1,161,846.47/1,239.01
  6. Step 6: Final answer
    x = 937.73

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1.5x scale

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.