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Finding the Fourth Proportional to 306.63, 459.89 and 90.21

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Solution

The fourth proportional to 306.63, 459.89 and 90.21 is: 135.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.63 : 459.89 = 90.21 : x
  2. Step 2: Convert to fraction form
    306.63/459.89 = 90.21/x
  3. Step 3: Cross multiply
    306.63x = 459.89 × 90.21
  4. Step 4: Simplify right side
    306.63x = 41,486.23
  5. Step 5: Solve for x
    x = 41,486.23/306.63
  6. Step 6: Final answer
    x = 135.30

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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.