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Finding the Fourth Proportional to 2,424.12, 3,636.90 and 780.90

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Solution

The fourth proportional to 2,424.12, 3,636.90 and 780.90 is: 1,171.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,424.12 : 3,636.90 = 780.90 : x
  2. Step 2: Convert to fraction form
    2,424.12/3,636.90 = 780.90/x
  3. Step 3: Cross multiply
    2,424.12x = 3,636.90 × 780.90
  4. Step 4: Simplify right side
    2,424.12x = 2,840,055.21
  5. Step 5: Solve for x
    x = 2,840,055.21/2,424.12
  6. Step 6: Final answer
    x = 1,171.58

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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.