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Finding the Fourth Proportional to 500.58, 689.40 and 499.12

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Solution

The fourth proportional to 500.58, 689.40 and 499.12 is: 687.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.58 : 689.40 = 499.12 : x
  2. Step 2: Convert to fraction form
    500.58/689.40 = 499.12/x
  3. Step 3: Cross multiply
    500.58x = 689.40 × 499.12
  4. Step 4: Simplify right side
    500.58x = 344,093.33
  5. Step 5: Solve for x
    x = 344,093.33/500.58
  6. Step 6: Final answer
    x = 687.39

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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.