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Finding the Fourth Proportional to 3,618.76, 5,415.90 and 1,970.92

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Solution

The fourth proportional to 3,618.76, 5,415.90 and 1,970.92 is: 2,949.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.76 : 5,415.90 = 1,970.92 : x
  2. Step 2: Convert to fraction form
    3,618.76/5,415.90 = 1,970.92/x
  3. Step 3: Cross multiply
    3,618.76x = 5,415.90 × 1,970.92
  4. Step 4: Simplify right side
    3,618.76x = 10,674,305.63
  5. Step 5: Solve for x
    x = 10,674,305.63/3,618.76
  6. Step 6: Final answer
    x = 2,949.71

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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.