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Finding the Fourth Proportional to 1,853.66, 2,780.90 and 555.12

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Solution

The fourth proportional to 1,853.66, 2,780.90 and 555.12 is: 832.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.66 : 2,780.90 = 555.12 : x
  2. Step 2: Convert to fraction form
    1,853.66/2,780.90 = 555.12/x
  3. Step 3: Cross multiply
    1,853.66x = 2,780.90 × 555.12
  4. Step 4: Simplify right side
    1,853.66x = 1,543,733.21
  5. Step 5: Solve for x
    x = 1,543,733.21/1,853.66
  6. Step 6: Final answer
    x = 832.80

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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.