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Finding the Fourth Proportional to 654.42, 981.15 and 215.53

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Solution

The fourth proportional to 654.42, 981.15 and 215.53 is: 323.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.42 : 981.15 = 215.53 : x
  2. Step 2: Convert to fraction form
    654.42/981.15 = 215.53/x
  3. Step 3: Cross multiply
    654.42x = 981.15 × 215.53
  4. Step 4: Simplify right side
    654.42x = 211,467.26
  5. Step 5: Solve for x
    x = 211,467.26/654.42
  6. Step 6: Final answer
    x = 323.14

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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.