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Finding the Fourth Proportional to 2,097.47, 3,144.21 and 780.87

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Solution

The fourth proportional to 2,097.47, 3,144.21 and 780.87 is: 1,170.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,097.47 : 3,144.21 = 780.87 : x
  2. Step 2: Convert to fraction form
    2,097.47/3,144.21 = 780.87/x
  3. Step 3: Cross multiply
    2,097.47x = 3,144.21 × 780.87
  4. Step 4: Simplify right side
    2,097.47x = 2,455,219.26
  5. Step 5: Solve for x
    x = 2,455,219.26/2,097.47
  6. Step 6: Final answer
    x = 1,170.56

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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.