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Finding the Fourth Proportional to 1,081.90, 1,492.80 and 639.46

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Solution

The fourth proportional to 1,081.90, 1,492.80 and 639.46 is: 882.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.90 : 1,492.80 = 639.46 : x
  2. Step 2: Convert to fraction form
    1,081.90/1,492.80 = 639.46/x
  3. Step 3: Cross multiply
    1,081.90x = 1,492.80 × 639.46
  4. Step 4: Simplify right side
    1,081.90x = 954,585.89
  5. Step 5: Solve for x
    x = 954,585.89/1,081.90
  6. Step 6: Final answer
    x = 882.32

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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.