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Finding the Fourth Proportional to 719.46, 990.78 and 498.03

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Solution

The fourth proportional to 719.46, 990.78 and 498.03 is: 685.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.46 : 990.78 = 498.03 : x
  2. Step 2: Convert to fraction form
    719.46/990.78 = 498.03/x
  3. Step 3: Cross multiply
    719.46x = 990.78 × 498.03
  4. Step 4: Simplify right side
    719.46x = 493,439.41
  5. Step 5: Solve for x
    x = 493,439.41/719.46
  6. Step 6: Final answer
    x = 685.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.