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Finding the Fourth Proportional to 499.08, 688.74 and 289.25

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Solution

The fourth proportional to 499.08, 688.74 and 289.25 is: 399.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.08 : 688.74 = 289.25 : x
  2. Step 2: Convert to fraction form
    499.08/688.74 = 289.25/x
  3. Step 3: Cross multiply
    499.08x = 688.74 × 289.25
  4. Step 4: Simplify right side
    499.08x = 199,214.60
  5. Step 5: Solve for x
    x = 199,214.60/499.08
  6. Step 6: Final answer
    x = 399.16

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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.