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Finding the Fourth Proportional to 1,857.03, 2,785.11 and 540.78

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Solution

The fourth proportional to 1,857.03, 2,785.11 and 540.78 is: 811.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,857.03 : 2,785.11 = 540.78 : x
  2. Step 2: Convert to fraction form
    1,857.03/2,785.11 = 540.78/x
  3. Step 3: Cross multiply
    1,857.03x = 2,785.11 × 540.78
  4. Step 4: Simplify right side
    1,857.03x = 1,506,131.79
  5. Step 5: Solve for x
    x = 1,506,131.79/1,857.03
  6. Step 6: Final answer
    x = 811.04

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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.