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Finding the Fourth Proportional to 751.94, 1,039.70 and 659.69

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Solution

The fourth proportional to 751.94, 1,039.70 and 659.69 is: 912.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.94 : 1,039.70 = 659.69 : x
  2. Step 2: Convert to fraction form
    751.94/1,039.70 = 659.69/x
  3. Step 3: Cross multiply
    751.94x = 1,039.70 × 659.69
  4. Step 4: Simplify right side
    751.94x = 685,876.39
  5. Step 5: Solve for x
    x = 685,876.39/751.94
  6. Step 6: Final answer
    x = 912.14

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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.