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Finding the Fourth Proportional to 499.34, 689.12 and 289.52

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Solution

The fourth proportional to 499.34, 689.12 and 289.52 is: 399.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.34 : 689.12 = 289.52 : x
  2. Step 2: Convert to fraction form
    499.34/689.12 = 289.52/x
  3. Step 3: Cross multiply
    499.34x = 689.12 × 289.52
  4. Step 4: Simplify right side
    499.34x = 199,509.13
  5. Step 5: Solve for x
    x = 199,509.13/499.34
  6. Step 6: Final answer
    x = 399.54

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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.