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Finding the Fourth Proportional to 459.36, 688.43 and 215.45

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Solution

The fourth proportional to 459.36, 688.43 and 215.45 is: 322.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.36 : 688.43 = 215.45 : x
  2. Step 2: Convert to fraction form
    459.36/688.43 = 215.45/x
  3. Step 3: Cross multiply
    459.36x = 688.43 × 215.45
  4. Step 4: Simplify right side
    459.36x = 148,322.24
  5. Step 5: Solve for x
    x = 148,322.24/459.36
  6. Step 6: Final answer
    x = 322.89

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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.