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Finding the Fourth Proportional to 480.23, 718.98 and 387.99

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Solution

The fourth proportional to 480.23, 718.98 and 387.99 is: 580.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    480.23 : 718.98 = 387.99 : x
  2. Step 2: Convert to fraction form
    480.23/718.98 = 387.99/x
  3. Step 3: Cross multiply
    480.23x = 718.98 × 387.99
  4. Step 4: Simplify right side
    480.23x = 278,955.60
  5. Step 5: Solve for x
    x = 278,955.60/480.23
  6. Step 6: Final answer
    x = 580.88

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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.