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Finding the Fourth Proportional to 499.14, 689.10 and 324.60

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Solution

The fourth proportional to 499.14, 689.10 and 324.60 is: 448.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.14 : 689.10 = 324.60 : x
  2. Step 2: Convert to fraction form
    499.14/689.10 = 324.60/x
  3. Step 3: Cross multiply
    499.14x = 689.10 × 324.60
  4. Step 4: Simplify right side
    499.14x = 223,681.86
  5. Step 5: Solve for x
    x = 223,681.86/499.14
  6. Step 6: Final answer
    x = 448.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.