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Finding the Fourth Proportional to 1,221.56, 1,832.74 and 491.32

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Solution

The fourth proportional to 1,221.56, 1,832.74 and 491.32 is: 737.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221.56 : 1,832.74 = 491.32 : x
  2. Step 2: Convert to fraction form
    1,221.56/1,832.74 = 491.32/x
  3. Step 3: Cross multiply
    1,221.56x = 1,832.74 × 491.32
  4. Step 4: Simplify right side
    1,221.56x = 900,461.82
  5. Step 5: Solve for x
    x = 900,461.82/1,221.56
  6. Step 6: Final answer
    x = 737.14

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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.