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Finding the Fourth Proportional to 718.77, 991.64 and 438.81

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Solution

The fourth proportional to 718.77, 991.64 and 438.81 is: 605.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.77 : 991.64 = 438.81 : x
  2. Step 2: Convert to fraction form
    718.77/991.64 = 438.81/x
  3. Step 3: Cross multiply
    718.77x = 991.64 × 438.81
  4. Step 4: Simplify right side
    718.77x = 435,139.35
  5. Step 5: Solve for x
    x = 435,139.35/718.77
  6. Step 6: Final answer
    x = 605.39

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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.