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Finding the Fourth Proportional to 1,172.53, 1,618.13 and 648.61

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Solution

The fourth proportional to 1,172.53, 1,618.13 and 648.61 is: 895.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.53 : 1,618.13 = 648.61 : x
  2. Step 2: Convert to fraction form
    1,172.53/1,618.13 = 648.61/x
  3. Step 3: Cross multiply
    1,172.53x = 1,618.13 × 648.61
  4. Step 4: Simplify right side
    1,172.53x = 1,049,532.06
  5. Step 5: Solve for x
    x = 1,049,532.06/1,172.53
  6. Step 6: Final answer
    x = 895.10

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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.