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Finding the Fourth Proportional to 1,521.85, 2,100.12 and 892.39

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Solution

The fourth proportional to 1,521.85, 2,100.12 and 892.39 is: 1,231.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,521.85 : 2,100.12 = 892.39 : x
  2. Step 2: Convert to fraction form
    1,521.85/2,100.12 = 892.39/x
  3. Step 3: Cross multiply
    1,521.85x = 2,100.12 × 892.39
  4. Step 4: Simplify right side
    1,521.85x = 1,874,126.09
  5. Step 5: Solve for x
    x = 1,874,126.09/1,521.85
  6. Step 6: Final answer
    x = 1,231.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.