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Finding the Fourth Proportional to 1,172.40, 1,617.76 and 648.40

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Solution

The fourth proportional to 1,172.40, 1,617.76 and 648.40 is: 894.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172.40 : 1,617.76 = 648.40 : x
  2. Step 2: Convert to fraction form
    1,172.40/1,617.76 = 648.40/x
  3. Step 3: Cross multiply
    1,172.40x = 1,617.76 × 648.40
  4. Step 4: Simplify right side
    1,172.40x = 1,048,955.58
  5. Step 5: Solve for x
    x = 1,048,955.58/1,172.40
  6. Step 6: Final answer
    x = 894.71

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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.