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Finding the Fourth Proportional to 1,415.48, 2,119.77 and 685.46

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Solution

The fourth proportional to 1,415.48, 2,119.77 and 685.46 is: 1,026.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,415.48 : 2,119.77 = 685.46 : x
  2. Step 2: Convert to fraction form
    1,415.48/2,119.77 = 685.46/x
  3. Step 3: Cross multiply
    1,415.48x = 2,119.77 × 685.46
  4. Step 4: Simplify right side
    1,415.48x = 1,453,022.84
  5. Step 5: Solve for x
    x = 1,453,022.84/1,415.48
  6. Step 6: Final answer
    x = 1,026.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.