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Finding the Fourth Proportional to 718.80, 992.01 and 439.22

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Solution

The fourth proportional to 718.80, 992.01 and 439.22 is: 606.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.80 : 992.01 = 439.22 : x
  2. Step 2: Convert to fraction form
    718.80/992.01 = 439.22/x
  3. Step 3: Cross multiply
    718.80x = 992.01 × 439.22
  4. Step 4: Simplify right side
    718.80x = 435,705.67
  5. Step 5: Solve for x
    x = 435,705.67/718.80
  6. Step 6: Final answer
    x = 606.16

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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.