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Finding the Fourth Proportional to 1,081.40, 1,492.24 and 633.20

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Solution

The fourth proportional to 1,081.40, 1,492.24 and 633.20 is: 873.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.40 : 1,492.24 = 633.20 : x
  2. Step 2: Convert to fraction form
    1,081.40/1,492.24 = 633.20/x
  3. Step 3: Cross multiply
    1,081.40x = 1,492.24 × 633.20
  4. Step 4: Simplify right side
    1,081.40x = 944,886.37
  5. Step 5: Solve for x
    x = 944,886.37/1,081.40
  6. Step 6: Final answer
    x = 873.76

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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.