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Finding the Fourth Proportional to 458.34, 687.30 and 145.91

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Solution

The fourth proportional to 458.34, 687.30 and 145.91 is: 218.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.34 : 687.30 = 145.91 : x
  2. Step 2: Convert to fraction form
    458.34/687.30 = 145.91/x
  3. Step 3: Cross multiply
    458.34x = 687.30 × 145.91
  4. Step 4: Simplify right side
    458.34x = 100,283.94
  5. Step 5: Solve for x
    x = 100,283.94/458.34
  6. Step 6: Final answer
    x = 218.80

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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.