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Finding the Fourth Proportional to 1,218.93, 1,679.99 and 971.07

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Solution

The fourth proportional to 1,218.93, 1,679.99 and 971.07 is: 1,338.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.93 : 1,679.99 = 971.07 : x
  2. Step 2: Convert to fraction form
    1,218.93/1,679.99 = 971.07/x
  3. Step 3: Cross multiply
    1,218.93x = 1,679.99 × 971.07
  4. Step 4: Simplify right side
    1,218.93x = 1,631,383.03
  5. Step 5: Solve for x
    x = 1,631,383.03/1,218.93
  6. Step 6: Final answer
    x = 1,338.37

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1.5x scale

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.