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Finding the Fourth Proportional to 653.99, 981.14 and 215.33

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Solution

The fourth proportional to 653.99, 981.14 and 215.33 is: 323.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.99 : 981.14 = 215.33 : x
  2. Step 2: Convert to fraction form
    653.99/981.14 = 215.33/x
  3. Step 3: Cross multiply
    653.99x = 981.14 × 215.33
  4. Step 4: Simplify right side
    653.99x = 211,262.89
  5. Step 5: Solve for x
    x = 211,262.89/653.99
  6. Step 6: Final answer
    x = 323.04

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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.