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Finding the Fourth Proportional to 458.94, 689.64 and 445.58

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Solution

The fourth proportional to 458.94, 689.64 and 445.58 is: 669.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.94 : 689.64 = 445.58 : x
  2. Step 2: Convert to fraction form
    458.94/689.64 = 445.58/x
  3. Step 3: Cross multiply
    458.94x = 689.64 × 445.58
  4. Step 4: Simplify right side
    458.94x = 307,289.79
  5. Step 5: Solve for x
    x = 307,289.79/458.94
  6. Step 6: Final answer
    x = 669.56

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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.