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Finding the Fourth Proportional to 1,408.96, 2,112.80 and 586.74

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Solution

The fourth proportional to 1,408.96, 2,112.80 and 586.74 is: 879.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.96 : 2,112.80 = 586.74 : x
  2. Step 2: Convert to fraction form
    1,408.96/2,112.80 = 586.74/x
  3. Step 3: Cross multiply
    1,408.96x = 2,112.80 × 586.74
  4. Step 4: Simplify right side
    1,408.96x = 1,239,661.34
  5. Step 5: Solve for x
    x = 1,239,661.34/1,408.96
  6. Step 6: Final answer
    x = 879.84

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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.