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Finding the Fourth Proportional to 2,890.76, 3,989.78 and 1,712.48

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Solution

The fourth proportional to 2,890.76, 3,989.78 and 1,712.48 is: 2,363.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.76 : 3,989.78 = 1,712.48 : x
  2. Step 2: Convert to fraction form
    2,890.76/3,989.78 = 1,712.48/x
  3. Step 3: Cross multiply
    2,890.76x = 3,989.78 × 1,712.48
  4. Step 4: Simplify right side
    2,890.76x = 6,832,418.45
  5. Step 5: Solve for x
    x = 6,832,418.45/2,890.76
  6. Step 6: Final answer
    x = 2,363.54

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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.