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Finding the Fourth Proportional to 1,853.91, 2,780.91 and 555.39

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Solution

The fourth proportional to 1,853.91, 2,780.91 and 555.39 is: 833.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.91 : 2,780.91 = 555.39 : x
  2. Step 2: Convert to fraction form
    1,853.91/2,780.91 = 555.39/x
  3. Step 3: Cross multiply
    1,853.91x = 2,780.91 × 555.39
  4. Step 4: Simplify right side
    1,853.91x = 1,544,489.60
  5. Step 5: Solve for x
    x = 1,544,489.60/1,853.91
  6. Step 6: Final answer
    x = 833.10

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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.