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Finding the Fourth Proportional to 1,811.64, 2,500.12 and 1,025.80

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Solution

The fourth proportional to 1,811.64, 2,500.12 and 1,025.80 is: 1,415.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.64 : 2,500.12 = 1,025.80 : x
  2. Step 2: Convert to fraction form
    1,811.64/2,500.12 = 1,025.80/x
  3. Step 3: Cross multiply
    1,811.64x = 2,500.12 × 1,025.80
  4. Step 4: Simplify right side
    1,811.64x = 2,564,623.10
  5. Step 5: Solve for x
    x = 2,564,623.10/1,811.64
  6. Step 6: Final answer
    x = 1,415.64

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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.