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Finding the Fourth Proportional to 518, 777.20 and 478.04

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Solution

The fourth proportional to 518, 777.20 and 478.04 is: 717.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 777.20 = 478.04 : x
  2. Step 2: Convert to fraction form
    518/777.20 = 478.04/x
  3. Step 3: Cross multiply
    518x = 777.20 × 478.04
  4. Step 4: Simplify right side
    518x = 371,532.69
  5. Step 5: Solve for x
    x = 371,532.69/518
  6. Step 6: Final answer
    x = 717.24

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.