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Finding the Fourth Proportional to 459.36, 688.88 and 215.84

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Solution

The fourth proportional to 459.36, 688.88 and 215.84 is: 323.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.36 : 688.88 = 215.84 : x
  2. Step 2: Convert to fraction form
    459.36/688.88 = 215.84/x
  3. Step 3: Cross multiply
    459.36x = 688.88 × 215.84
  4. Step 4: Simplify right side
    459.36x = 148,687.86
  5. Step 5: Solve for x
    x = 148,687.86/459.36
  6. Step 6: Final answer
    x = 323.68

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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.