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Finding the Fourth Proportional to 459.25, 688.39 and 215.57

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Solution

The fourth proportional to 459.25, 688.39 and 215.57 is: 323.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.25 : 688.39 = 215.57 : x
  2. Step 2: Convert to fraction form
    459.25/688.39 = 215.57/x
  3. Step 3: Cross multiply
    459.25x = 688.39 × 215.57
  4. Step 4: Simplify right side
    459.25x = 148,397.41
  5. Step 5: Solve for x
    x = 148,397.41/459.25
  6. Step 6: Final answer
    x = 323.13

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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.