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Finding the Fourth Proportional to 1,081.49, 1,492.13 and 661.41

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Solution

The fourth proportional to 1,081.49, 1,492.13 and 661.41 is: 912.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.49 : 1,492.13 = 661.41 : x
  2. Step 2: Convert to fraction form
    1,081.49/1,492.13 = 661.41/x
  3. Step 3: Cross multiply
    1,081.49x = 1,492.13 × 661.41
  4. Step 4: Simplify right side
    1,081.49x = 986,911.36
  5. Step 5: Solve for x
    x = 986,911.36/1,081.49
  6. Step 6: Final answer
    x = 912.55

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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.