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Finding the Fourth Proportional to 719.46, 990.90 and 621.18

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Solution

The fourth proportional to 719.46, 990.90 and 621.18 is: 855.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.46 : 990.90 = 621.18 : x
  2. Step 2: Convert to fraction form
    719.46/990.90 = 621.18/x
  3. Step 3: Cross multiply
    719.46x = 990.90 × 621.18
  4. Step 4: Simplify right side
    719.46x = 615,527.26
  5. Step 5: Solve for x
    x = 615,527.26/719.46
  6. Step 6: Final answer
    x = 855.54

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