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Finding the Fourth Proportional to 1,815.67, 2,724.72 and 661.42

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Solution

The fourth proportional to 1,815.67, 2,724.72 and 661.42 is: 992.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,815.67 : 2,724.72 = 661.42 : x
  2. Step 2: Convert to fraction form
    1,815.67/2,724.72 = 661.42/x
  3. Step 3: Cross multiply
    1,815.67x = 2,724.72 × 661.42
  4. Step 4: Simplify right side
    1,815.67x = 1,802,184.30
  5. Step 5: Solve for x
    x = 1,802,184.30/1,815.67
  6. Step 6: Final answer
    x = 992.57

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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.