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Finding the Fourth Proportional to 718.18, 991.05 and 485.38

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Solution

The fourth proportional to 718.18, 991.05 and 485.38 is: 669.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.18 : 991.05 = 485.38 : x
  2. Step 2: Convert to fraction form
    718.18/991.05 = 485.38/x
  3. Step 3: Cross multiply
    718.18x = 991.05 × 485.38
  4. Step 4: Simplify right side
    718.18x = 481,035.85
  5. Step 5: Solve for x
    x = 481,035.85/718.18
  6. Step 6: Final answer
    x = 669.80

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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.