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Finding the Fourth Proportional to 459.73, 687.54 and 438.54

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Solution

The fourth proportional to 459.73, 687.54 and 438.54 is: 655.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.73 : 687.54 = 438.54 : x
  2. Step 2: Convert to fraction form
    459.73/687.54 = 438.54/x
  3. Step 3: Cross multiply
    459.73x = 687.54 × 438.54
  4. Step 4: Simplify right side
    459.73x = 301,512.32
  5. Step 5: Solve for x
    x = 301,512.32/459.73
  6. Step 6: Final answer
    x = 655.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.