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Finding the Fourth Proportional to 1,853.20, 2,780.70 and 879.13

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Solution

The fourth proportional to 1,853.20, 2,780.70 and 879.13 is: 1,319.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,853.20 : 2,780.70 = 879.13 : x
  2. Step 2: Convert to fraction form
    1,853.20/2,780.70 = 879.13/x
  3. Step 3: Cross multiply
    1,853.20x = 2,780.70 × 879.13
  4. Step 4: Simplify right side
    1,853.20x = 2,444,596.79
  5. Step 5: Solve for x
    x = 2,444,596.79/1,853.20
  6. Step 6: Final answer
    x = 1,319.12

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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.