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Finding the Fourth Proportional to 459.72, 689.30 and 216.30

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Solution

The fourth proportional to 459.72, 689.30 and 216.30 is: 324.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.72 : 689.30 = 216.30 : x
  2. Step 2: Convert to fraction form
    459.72/689.30 = 216.30/x
  3. Step 3: Cross multiply
    459.72x = 689.30 × 216.30
  4. Step 4: Simplify right side
    459.72x = 149,095.59
  5. Step 5: Solve for x
    x = 149,095.59/459.72
  6. Step 6: Final answer
    x = 324.32

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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.