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Finding the Fourth Proportional to 499.32, 689.00 and 289.58

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Solution

The fourth proportional to 499.32, 689.00 and 289.58 is: 399.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.32 : 689.00 = 289.58 : x
  2. Step 2: Convert to fraction form
    499.32/689.00 = 289.58/x
  3. Step 3: Cross multiply
    499.32x = 689.00 × 289.58
  4. Step 4: Simplify right side
    499.32x = 199,515.73
  5. Step 5: Solve for x
    x = 199,515.73/499.32
  6. Step 6: Final answer
    x = 399.57

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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.