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Finding the Fourth Proportional to 458.82, 688.35 and 239.40

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Solution

The fourth proportional to 458.82, 688.35 and 239.40 is: 359.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.82 : 688.35 = 239.40 : x
  2. Step 2: Convert to fraction form
    458.82/688.35 = 239.40/x
  3. Step 3: Cross multiply
    458.82x = 688.35 × 239.40
  4. Step 4: Simplify right side
    458.82x = 164,790.99
  5. Step 5: Solve for x
    x = 164,790.99/458.82
  6. Step 6: Final answer
    x = 359.16

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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.