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Finding the Fourth Proportional to 1,081.24, 1,492.22 and 661.87

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Solution

The fourth proportional to 1,081.24, 1,492.22 and 661.87 is: 913.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.24 : 1,492.22 = 661.87 : x
  2. Step 2: Convert to fraction form
    1,081.24/1,492.22 = 661.87/x
  3. Step 3: Cross multiply
    1,081.24x = 1,492.22 × 661.87
  4. Step 4: Simplify right side
    1,081.24x = 987,653.79
  5. Step 5: Solve for x
    x = 987,653.79/1,081.24
  6. Step 6: Final answer
    x = 913.45

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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.