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Finding the Fourth Proportional to 1,408.56, 2,110.08 and 666.72

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Solution

The fourth proportional to 1,408.56, 2,110.08 and 666.72 is: 998.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,408.56 : 2,110.08 = 666.72 : x
  2. Step 2: Convert to fraction form
    1,408.56/2,110.08 = 666.72/x
  3. Step 3: Cross multiply
    1,408.56x = 2,110.08 × 666.72
  4. Step 4: Simplify right side
    1,408.56x = 1,406,832.54
  5. Step 5: Solve for x
    x = 1,406,832.54/1,408.56
  6. Step 6: Final answer
    x = 998.77

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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.