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Finding the Fourth Proportional to 458.88, 688 and 215.27

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Solution

The fourth proportional to 458.88, 688 and 215.27 is: 322.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.88 : 688 = 215.27 : x
  2. Step 2: Convert to fraction form
    458.88/688 = 215.27/x
  3. Step 3: Cross multiply
    458.88x = 688 × 215.27
  4. Step 4: Simplify right side
    458.88x = 148,105.76
  5. Step 5: Solve for x
    x = 148,105.76/458.88
  6. Step 6: Final answer
    x = 322.75

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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.