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Finding the Fourth Proportional to 1,091.21, 1,636.47 and 474.75

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Solution

The fourth proportional to 1,091.21, 1,636.47 and 474.75 is: 711.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.21 : 1,636.47 = 474.75 : x
  2. Step 2: Convert to fraction form
    1,091.21/1,636.47 = 474.75/x
  3. Step 3: Cross multiply
    1,091.21x = 1,636.47 × 474.75
  4. Step 4: Simplify right side
    1,091.21x = 776,914.13
  5. Step 5: Solve for x
    x = 776,914.13/1,091.21
  6. Step 6: Final answer
    x = 711.98

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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.