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Finding the Fourth Proportional to 1,905.76, 2,859 and 810.12

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Solution

The fourth proportional to 1,905.76, 2,859 and 810.12 is: 1,215.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.76 : 2,859 = 810.12 : x
  2. Step 2: Convert to fraction form
    1,905.76/2,859 = 810.12/x
  3. Step 3: Cross multiply
    1,905.76x = 2,859 × 810.12
  4. Step 4: Simplify right side
    1,905.76x = 2,316,133.08
  5. Step 5: Solve for x
    x = 2,316,133.08/1,905.76
  6. Step 6: Final answer
    x = 1,215.33

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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.