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Finding the Fourth Proportional to 458.94, 688.59 and 421.14

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Solution

The fourth proportional to 458.94, 688.59 and 421.14 is: 631.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.94 : 688.59 = 421.14 : x
  2. Step 2: Convert to fraction form
    458.94/688.59 = 421.14/x
  3. Step 3: Cross multiply
    458.94x = 688.59 × 421.14
  4. Step 4: Simplify right side
    458.94x = 289,992.79
  5. Step 5: Solve for x
    x = 289,992.79/458.94
  6. Step 6: Final answer
    x = 631.88

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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.