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Finding the Fourth Proportional to 1,408.88, 2,112.49 and 657.56

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Solution

The fourth proportional to 1,408.88, 2,112.49 and 657.56 is: 985.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.88 : 2,112.49 = 657.56 : x
  2. Step 2: Convert to fraction form
    1,408.88/2,112.49 = 657.56/x
  3. Step 3: Cross multiply
    1,408.88x = 2,112.49 × 657.56
  4. Step 4: Simplify right side
    1,408.88x = 1,389,088.92
  5. Step 5: Solve for x
    x = 1,389,088.92/1,408.88
  6. Step 6: Final answer
    x = 985.95

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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.