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Finding the Fourth Proportional to 1,081.19, 1,492.05 and 639.11

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Solution

The fourth proportional to 1,081.19, 1,492.05 and 639.11 is: 881.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.19 : 1,492.05 = 639.11 : x
  2. Step 2: Convert to fraction form
    1,081.19/1,492.05 = 639.11/x
  3. Step 3: Cross multiply
    1,081.19x = 1,492.05 × 639.11
  4. Step 4: Simplify right side
    1,081.19x = 953,590.20
  5. Step 5: Solve for x
    x = 953,590.20/1,081.19
  6. Step 6: Final answer
    x = 881.98

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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.