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Finding the Fourth Proportional to 399.50, 598.70 and 216.98

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Solution

The fourth proportional to 399.50, 598.70 and 216.98 is: 325.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.50 : 598.70 = 216.98 : x
  2. Step 2: Convert to fraction form
    399.50/598.70 = 216.98/x
  3. Step 3: Cross multiply
    399.50x = 598.70 × 216.98
  4. Step 4: Simplify right side
    399.50x = 129,905.93
  5. Step 5: Solve for x
    x = 129,905.93/399.50
  6. Step 6: Final answer
    x = 325.17

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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.