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Finding the Fourth Proportional to 2,118.72, 3,178.26 and 732

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Solution

The fourth proportional to 2,118.72, 3,178.26 and 732 is: 1,098.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.72 : 3,178.26 = 732 : x
  2. Step 2: Convert to fraction form
    2,118.72/3,178.26 = 732/x
  3. Step 3: Cross multiply
    2,118.72x = 3,178.26 × 732
  4. Step 4: Simplify right side
    2,118.72x = 2,326,486.32
  5. Step 5: Solve for x
    x = 2,326,486.32/2,118.72
  6. Step 6: Final answer
    x = 1,098.06

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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.