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Finding the Fourth Proportional to 2,780.10, 4,169.88 and 728.10

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Solution

The fourth proportional to 2,780.10, 4,169.88 and 728.10 is: 1,092.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.10 : 4,169.88 = 728.10 : x
  2. Step 2: Convert to fraction form
    2,780.10/4,169.88 = 728.10/x
  3. Step 3: Cross multiply
    2,780.10x = 4,169.88 × 728.10
  4. Step 4: Simplify right side
    2,780.10x = 3,036,089.63
  5. Step 5: Solve for x
    x = 3,036,089.63/2,780.10
  6. Step 6: Final answer
    x = 1,092.08

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1.5x scale

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.