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Finding the Fourth Proportional to 306.98, 459.95 and 215.51

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Solution

The fourth proportional to 306.98, 459.95 and 215.51 is: 322.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.98 : 459.95 = 215.51 : x
  2. Step 2: Convert to fraction form
    306.98/459.95 = 215.51/x
  3. Step 3: Cross multiply
    306.98x = 459.95 × 215.51
  4. Step 4: Simplify right side
    306.98x = 99,124.85
  5. Step 5: Solve for x
    x = 99,124.85/306.98
  6. Step 6: Final answer
    x = 322.91

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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.