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Finding the Fourth Proportional to 1,172.16, 1,617.57 and 648.20

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Solution

The fourth proportional to 1,172.16, 1,617.57 and 648.20 is: 894.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.16 : 1,617.57 = 648.20 : x
  2. Step 2: Convert to fraction form
    1,172.16/1,617.57 = 648.20/x
  3. Step 3: Cross multiply
    1,172.16x = 1,617.57 × 648.20
  4. Step 4: Simplify right side
    1,172.16x = 1,048,508.87
  5. Step 5: Solve for x
    x = 1,048,508.87/1,172.16
  6. Step 6: Final answer
    x = 894.51

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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.