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Finding the Fourth Proportional to 306.60, 459.36 and 290.40

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Solution

The fourth proportional to 306.60, 459.36 and 290.40 is: 435.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.60 : 459.36 = 290.40 : x
  2. Step 2: Convert to fraction form
    306.60/459.36 = 290.40/x
  3. Step 3: Cross multiply
    306.60x = 459.36 × 290.40
  4. Step 4: Simplify right side
    306.60x = 133,398.14
  5. Step 5: Solve for x
    x = 133,398.14/306.60
  6. Step 6: Final answer
    x = 435.09

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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.