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Finding the Fourth Proportional to 718.76, 991.97 and 439.01

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Solution

The fourth proportional to 718.76, 991.97 and 439.01 is: 605.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.76 : 991.97 = 439.01 : x
  2. Step 2: Convert to fraction form
    718.76/991.97 = 439.01/x
  3. Step 3: Cross multiply
    718.76x = 991.97 × 439.01
  4. Step 4: Simplify right side
    718.76x = 435,477.59
  5. Step 5: Solve for x
    x = 435,477.59/718.76
  6. Step 6: Final answer
    x = 605.88

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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.