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Finding the Fourth Proportional to 1,855.52, 2,780.76 and 867.68

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Solution

The fourth proportional to 1,855.52, 2,780.76 and 867.68 is: 1,300.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,855.52 : 2,780.76 = 867.68 : x
  2. Step 2: Convert to fraction form
    1,855.52/2,780.76 = 867.68/x
  3. Step 3: Cross multiply
    1,855.52x = 2,780.76 × 867.68
  4. Step 4: Simplify right side
    1,855.52x = 2,412,809.84
  5. Step 5: Solve for x
    x = 2,412,809.84/1,855.52
  6. Step 6: Final answer
    x = 1,300.34

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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.