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Finding the Fourth Proportional to 458.30, 686.63 and 380.81

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Solution

The fourth proportional to 458.30, 686.63 and 380.81 is: 570.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.30 : 686.63 = 380.81 : x
  2. Step 2: Convert to fraction form
    458.30/686.63 = 380.81/x
  3. Step 3: Cross multiply
    458.30x = 686.63 × 380.81
  4. Step 4: Simplify right side
    458.30x = 261,470.23
  5. Step 5: Solve for x
    x = 261,470.23/458.30
  6. Step 6: Final answer
    x = 570.53

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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.