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Finding the Fourth Proportional to 2,520.16, 3,780.88 and 788.80

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Solution

The fourth proportional to 2,520.16, 3,780.88 and 788.80 is: 1,183.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,520.16 : 3,780.88 = 788.80 : x
  2. Step 2: Convert to fraction form
    2,520.16/3,780.88 = 788.80/x
  3. Step 3: Cross multiply
    2,520.16x = 3,780.88 × 788.80
  4. Step 4: Simplify right side
    2,520.16x = 2,982,358.14
  5. Step 5: Solve for x
    x = 2,982,358.14/2,520.16
  6. Step 6: Final answer
    x = 1,183.40

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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.