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Finding the Fourth Proportional to 718.04, 990.61 and 423.20

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Solution

The fourth proportional to 718.04, 990.61 and 423.20 is: 583.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.04 : 990.61 = 423.20 : x
  2. Step 2: Convert to fraction form
    718.04/990.61 = 423.20/x
  3. Step 3: Cross multiply
    718.04x = 990.61 × 423.20
  4. Step 4: Simplify right side
    718.04x = 419,226.15
  5. Step 5: Solve for x
    x = 419,226.15/718.04
  6. Step 6: Final answer
    x = 583.85

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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.