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Finding the Fourth Proportional to 458.93, 687.48 and 426.93

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Solution

The fourth proportional to 458.93, 687.48 and 426.93 is: 639.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.93 : 687.48 = 426.93 : x
  2. Step 2: Convert to fraction form
    458.93/687.48 = 426.93/x
  3. Step 3: Cross multiply
    458.93x = 687.48 × 426.93
  4. Step 4: Simplify right side
    458.93x = 293,505.84
  5. Step 5: Solve for x
    x = 293,505.84/458.93
  6. Step 6: Final answer
    x = 639.54

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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.