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Finding the Fourth Proportional to 1,172.26, 1,617.58 and 648.18

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Solution

The fourth proportional to 1,172.26, 1,617.58 and 648.18 is: 894.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.26 : 1,617.58 = 648.18 : x
  2. Step 2: Convert to fraction form
    1,172.26/1,617.58 = 648.18/x
  3. Step 3: Cross multiply
    1,172.26x = 1,617.58 × 648.18
  4. Step 4: Simplify right side
    1,172.26x = 1,048,483.00
  5. Step 5: Solve for x
    x = 1,048,483.00/1,172.26
  6. Step 6: Final answer
    x = 894.41

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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.