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Finding the Fourth Proportional to 3,111.93, 4,668.39 and 920.88

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Solution

The fourth proportional to 3,111.93, 4,668.39 and 920.88 is: 1,381.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.93 : 4,668.39 = 920.88 : x
  2. Step 2: Convert to fraction form
    3,111.93/4,668.39 = 920.88/x
  3. Step 3: Cross multiply
    3,111.93x = 4,668.39 × 920.88
  4. Step 4: Simplify right side
    3,111.93x = 4,299,026.98
  5. Step 5: Solve for x
    x = 4,299,026.98/3,111.93
  6. Step 6: Final answer
    x = 1,381.47

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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.