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Finding the Fourth Proportional to 1,618.11, 2,233.88 and 988.79

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Solution

The fourth proportional to 1,618.11, 2,233.88 and 988.79 is: 1,365.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,618.11 : 2,233.88 = 988.79 : x
  2. Step 2: Convert to fraction form
    1,618.11/2,233.88 = 988.79/x
  3. Step 3: Cross multiply
    1,618.11x = 2,233.88 × 988.79
  4. Step 4: Simplify right side
    1,618.11x = 2,208,822.09
  5. Step 5: Solve for x
    x = 2,208,822.09/1,618.11
  6. Step 6: Final answer
    x = 1,365.06

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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.