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Finding the Fourth Proportional to 1,853.73, 2,780.75 and 621.15

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Solution

The fourth proportional to 1,853.73, 2,780.75 and 621.15 is: 931.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.73 : 2,780.75 = 621.15 : x
  2. Step 2: Convert to fraction form
    1,853.73/2,780.75 = 621.15/x
  3. Step 3: Cross multiply
    1,853.73x = 2,780.75 × 621.15
  4. Step 4: Simplify right side
    1,853.73x = 1,727,259.76
  5. Step 5: Solve for x
    x = 1,727,259.76/1,853.73
  6. Step 6: Final answer
    x = 931.78

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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.