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Finding the Fourth Proportional to 459.72, 688.80 and 397.68

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Solution

The fourth proportional to 459.72, 688.80 and 397.68 is: 595.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.72 : 688.80 = 397.68 : x
  2. Step 2: Convert to fraction form
    459.72/688.80 = 397.68/x
  3. Step 3: Cross multiply
    459.72x = 688.80 × 397.68
  4. Step 4: Simplify right side
    459.72x = 273,921.98
  5. Step 5: Solve for x
    x = 273,921.98/459.72
  6. Step 6: Final answer
    x = 595.85

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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.