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Finding the Fourth Proportional to 479.92, 719.40 and 317.68

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Solution

The fourth proportional to 479.92, 719.40 and 317.68 is: 476.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.92 : 719.40 = 317.68 : x
  2. Step 2: Convert to fraction form
    479.92/719.40 = 317.68/x
  3. Step 3: Cross multiply
    479.92x = 719.40 × 317.68
  4. Step 4: Simplify right side
    479.92x = 228,538.99
  5. Step 5: Solve for x
    x = 228,538.99/479.92
  6. Step 6: Final answer
    x = 476.20

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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.