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Finding the Fourth Proportional to 3,112.29, 4,668.91 and 920.77

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Solution

The fourth proportional to 3,112.29, 4,668.91 and 920.77 is: 1,381.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,112.29 : 4,668.91 = 920.77 : x
  2. Step 2: Convert to fraction form
    3,112.29/4,668.91 = 920.77/x
  3. Step 3: Cross multiply
    3,112.29x = 4,668.91 × 920.77
  4. Step 4: Simplify right side
    3,112.29x = 4,298,978.29
  5. Step 5: Solve for x
    x = 4,298,978.29/3,112.29
  6. Step 6: Final answer
    x = 1,381.29

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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.