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Finding the Fourth Proportional to 480, 718.30 and 408.72

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Solution

The fourth proportional to 480, 718.30 and 408.72 is: 611.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    480 : 718.30 = 408.72 : x
  2. Step 2: Convert to fraction form
    480/718.30 = 408.72/x
  3. Step 3: Cross multiply
    480x = 718.30 × 408.72
  4. Step 4: Simplify right side
    480x = 293,583.58
  5. Step 5: Solve for x
    x = 293,583.58/480
  6. Step 6: Final answer
    x = 611.63

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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.