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Finding the Fourth Proportional to 480.21, 719.51 and 317.81

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Solution

The fourth proportional to 480.21, 719.51 and 317.81 is: 476.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.21 : 719.51 = 317.81 : x
  2. Step 2: Convert to fraction form
    480.21/719.51 = 317.81/x
  3. Step 3: Cross multiply
    480.21x = 719.51 × 317.81
  4. Step 4: Simplify right side
    480.21x = 228,662.29
  5. Step 5: Solve for x
    x = 228,662.29/480.21
  6. Step 6: Final answer
    x = 476.17

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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.