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Finding the Fourth Proportional to 306.11, 459.16 and 215.21

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Solution

The fourth proportional to 306.11, 459.16 and 215.21 is: 322.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.11 : 459.16 = 215.21 : x
  2. Step 2: Convert to fraction form
    306.11/459.16 = 215.21/x
  3. Step 3: Cross multiply
    306.11x = 459.16 × 215.21
  4. Step 4: Simplify right side
    306.11x = 98,816.36
  5. Step 5: Solve for x
    x = 98,816.36/306.11
  6. Step 6: Final answer
    x = 322.82

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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.