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Finding the Fourth Proportional to 718.20, 991.08 and 438.39

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Solution

The fourth proportional to 718.20, 991.08 and 438.39 is: 604.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.20 : 991.08 = 438.39 : x
  2. Step 2: Convert to fraction form
    718.20/991.08 = 438.39/x
  3. Step 3: Cross multiply
    718.20x = 991.08 × 438.39
  4. Step 4: Simplify right side
    718.20x = 434,479.56
  5. Step 5: Solve for x
    x = 434,479.56/718.20
  6. Step 6: Final answer
    x = 604.96

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1.5x scale

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.