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Finding the Fourth Proportional to 1,853.12, 2,780 and 620.65

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Solution

The fourth proportional to 1,853.12, 2,780 and 620.65 is: 931.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.12 : 2,780 = 620.65 : x
  2. Step 2: Convert to fraction form
    1,853.12/2,780 = 620.65/x
  3. Step 3: Cross multiply
    1,853.12x = 2,780 × 620.65
  4. Step 4: Simplify right side
    1,853.12x = 1,725,407
  5. Step 5: Solve for x
    x = 1,725,407/1,853.12
  6. Step 6: Final answer
    x = 931.08

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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.