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Finding the Fourth Proportional to 1,172.18, 1,617.61 and 641.07

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Solution

The fourth proportional to 1,172.18, 1,617.61 and 641.07 is: 884.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.18 : 1,617.61 = 641.07 : x
  2. Step 2: Convert to fraction form
    1,172.18/1,617.61 = 641.07/x
  3. Step 3: Cross multiply
    1,172.18x = 1,617.61 × 641.07
  4. Step 4: Simplify right side
    1,172.18x = 1,037,001.24
  5. Step 5: Solve for x
    x = 1,037,001.24/1,172.18
  6. Step 6: Final answer
    x = 884.68

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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.