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Finding the Fourth Proportional to 1,215.71, 1,824.47 and 864.27

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Solution

The fourth proportional to 1,215.71, 1,824.47 and 864.27 is: 1,297.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.71 : 1,824.47 = 864.27 : x
  2. Step 2: Convert to fraction form
    1,215.71/1,824.47 = 864.27/x
  3. Step 3: Cross multiply
    1,215.71x = 1,824.47 × 864.27
  4. Step 4: Simplify right side
    1,215.71x = 1,576,825.14
  5. Step 5: Solve for x
    x = 1,576,825.14/1,215.71
  6. Step 6: Final answer
    x = 1,297.05

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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.