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Finding the Fourth Proportional to 459.40, 689.76 and 323.32

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Solution

The fourth proportional to 459.40, 689.76 and 323.32 is: 485.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.40 : 689.76 = 323.32 : x
  2. Step 2: Convert to fraction form
    459.40/689.76 = 323.32/x
  3. Step 3: Cross multiply
    459.40x = 689.76 × 323.32
  4. Step 4: Simplify right side
    459.40x = 223,013.20
  5. Step 5: Solve for x
    x = 223,013.20/459.40
  6. Step 6: Final answer
    x = 485.44

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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.