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Finding the Fourth Proportional to 718.13, 990.77 and 419.45

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Solution

The fourth proportional to 718.13, 990.77 and 419.45 is: 578.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.13 : 990.77 = 419.45 : x
  2. Step 2: Convert to fraction form
    718.13/990.77 = 419.45/x
  3. Step 3: Cross multiply
    718.13x = 990.77 × 419.45
  4. Step 4: Simplify right side
    718.13x = 415,571.43
  5. Step 5: Solve for x
    x = 415,571.43/718.13
  6. Step 6: Final answer
    x = 578.68

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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.