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Finding the Fourth Proportional to 1,171.21, 1,616.23 and 647.23

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Solution

The fourth proportional to 1,171.21, 1,616.23 and 647.23 is: 893.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,171.21 : 1,616.23 = 647.23 : x
  2. Step 2: Convert to fraction form
    1,171.21/1,616.23 = 647.23/x
  3. Step 3: Cross multiply
    1,171.21x = 1,616.23 × 647.23
  4. Step 4: Simplify right side
    1,171.21x = 1,046,072.54
  5. Step 5: Solve for x
    x = 1,046,072.54/1,171.21
  6. Step 6: Final answer
    x = 893.16

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.