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Finding the Fourth Proportional to 3,911.29, 5,866.88 and 989.57

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Solution

The fourth proportional to 3,911.29, 5,866.88 and 989.57 is: 1,484.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,911.29 : 5,866.88 = 989.57 : x
  2. Step 2: Convert to fraction form
    3,911.29/5,866.88 = 989.57/x
  3. Step 3: Cross multiply
    3,911.29x = 5,866.88 × 989.57
  4. Step 4: Simplify right side
    3,911.29x = 5,805,698.16
  5. Step 5: Solve for x
    x = 5,805,698.16/3,911.29
  6. Step 6: Final answer
    x = 1,484.34

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1.5x scale

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.