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Finding the Fourth Proportional to 3,920.81, 5,881.18 and 999.11

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Solution

The fourth proportional to 3,920.81, 5,881.18 and 999.11 is: 1,498.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,920.81 : 5,881.18 = 999.11 : x
  2. Step 2: Convert to fraction form
    3,920.81/5,881.18 = 999.11/x
  3. Step 3: Cross multiply
    3,920.81x = 5,881.18 × 999.11
  4. Step 4: Simplify right side
    3,920.81x = 5,875,911.35
  5. Step 5: Solve for x
    x = 5,875,911.35/3,920.81
  6. Step 6: Final answer
    x = 1,498.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.