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Finding the Fourth Proportional to 1,172, 1,617.42 and 674.76

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Solution

The fourth proportional to 1,172, 1,617.42 and 674.76 is: 931.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172 : 1,617.42 = 674.76 : x
  2. Step 2: Convert to fraction form
    1,172/1,617.42 = 674.76/x
  3. Step 3: Cross multiply
    1,172x = 1,617.42 × 674.76
  4. Step 4: Simplify right side
    1,172x = 1,091,370.32
  5. Step 5: Solve for x
    x = 1,091,370.32/1,172
  6. Step 6: Final answer
    x = 931.20

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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.