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Finding the Fourth Proportional to 718.12, 990.60 and 423.35

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Solution

The fourth proportional to 718.12, 990.60 and 423.35 is: 583.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.12 : 990.60 = 423.35 : x
  2. Step 2: Convert to fraction form
    718.12/990.60 = 423.35/x
  3. Step 3: Cross multiply
    718.12x = 990.60 × 423.35
  4. Step 4: Simplify right side
    718.12x = 419,365.56
  5. Step 5: Solve for x
    x = 419,365.56/718.12
  6. Step 6: Final answer
    x = 583.98

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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.