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Finding the Fourth Proportional to 1,081.70, 1,492.70 and 639.52

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Solution

The fourth proportional to 1,081.70, 1,492.70 and 639.52 is: 882.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.70 : 1,492.70 = 639.52 : x
  2. Step 2: Convert to fraction form
    1,081.70/1,492.70 = 639.52/x
  3. Step 3: Cross multiply
    1,081.70x = 1,492.70 × 639.52
  4. Step 4: Simplify right side
    1,081.70x = 954,611.50
  5. Step 5: Solve for x
    x = 954,611.50/1,081.70
  6. Step 6: Final answer
    x = 882.51

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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.