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Finding the Fourth Proportional to 306.51, 459.86 and 90.09

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Solution

The fourth proportional to 306.51, 459.86 and 90.09 is: 135.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.51 : 459.86 = 90.09 : x
  2. Step 2: Convert to fraction form
    306.51/459.86 = 90.09/x
  3. Step 3: Cross multiply
    306.51x = 459.86 × 90.09
  4. Step 4: Simplify right side
    306.51x = 41,428.34
  5. Step 5: Solve for x
    x = 41,428.34/306.51
  6. Step 6: Final answer
    x = 135.16

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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.