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Finding the Fourth Proportional to 1,408.87, 2,112.65 and 586.65

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Solution

The fourth proportional to 1,408.87, 2,112.65 and 586.65 is: 879.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.87 : 2,112.65 = 586.65 : x
  2. Step 2: Convert to fraction form
    1,408.87/2,112.65 = 586.65/x
  3. Step 3: Cross multiply
    1,408.87x = 2,112.65 × 586.65
  4. Step 4: Simplify right side
    1,408.87x = 1,239,387.59
  5. Step 5: Solve for x
    x = 1,239,387.59/1,408.87
  6. Step 6: Final answer
    x = 879.70

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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.