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Finding the Fourth Proportional to 2,085.92, 3,128.96 and 625.20

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Solution

The fourth proportional to 2,085.92, 3,128.96 and 625.20 is: 937.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.92 : 3,128.96 = 625.20 : x
  2. Step 2: Convert to fraction form
    2,085.92/3,128.96 = 625.20/x
  3. Step 3: Cross multiply
    2,085.92x = 3,128.96 × 625.20
  4. Step 4: Simplify right side
    2,085.92x = 1,956,225.79
  5. Step 5: Solve for x
    x = 1,956,225.79/2,085.92
  6. Step 6: Final answer
    x = 937.82

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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.