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Finding the Fourth Proportional to 306.98, 459.93 and 215.50

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Solution

The fourth proportional to 306.98, 459.93 and 215.50 is: 322.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.98 : 459.93 = 215.50 : x
  2. Step 2: Convert to fraction form
    306.98/459.93 = 215.50/x
  3. Step 3: Cross multiply
    306.98x = 459.93 × 215.50
  4. Step 4: Simplify right side
    306.98x = 99,112.62
  5. Step 5: Solve for x
    x = 99,112.62/306.98
  6. Step 6: Final answer
    x = 322.87

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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.