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Finding the Fourth Proportional to 3,111.96, 4,668.45 and 920.91

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Solution

The fourth proportional to 3,111.96, 4,668.45 and 920.91 is: 1,381.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.96 : 4,668.45 = 920.91 : x
  2. Step 2: Convert to fraction form
    3,111.96/4,668.45 = 920.91/x
  3. Step 3: Cross multiply
    3,111.96x = 4,668.45 × 920.91
  4. Step 4: Simplify right side
    3,111.96x = 4,299,222.29
  5. Step 5: Solve for x
    x = 4,299,222.29/3,111.96
  6. Step 6: Final answer
    x = 1,381.52

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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.