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Finding the Fourth Proportional to 406.08, 607.68 and 319.68

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Solution

The fourth proportional to 406.08, 607.68 and 319.68 is: 478.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.08 : 607.68 = 319.68 : x
  2. Step 2: Convert to fraction form
    406.08/607.68 = 319.68/x
  3. Step 3: Cross multiply
    406.08x = 607.68 × 319.68
  4. Step 4: Simplify right side
    406.08x = 194,263.14
  5. Step 5: Solve for x
    x = 194,263.14/406.08
  6. Step 6: Final answer
    x = 478.39

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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.