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Finding the Fourth Proportional to 718.47, 991.67 and 438.75

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Solution

The fourth proportional to 718.47, 991.67 and 438.75 is: 605.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.47 : 991.67 = 438.75 : x
  2. Step 2: Convert to fraction form
    718.47/991.67 = 438.75/x
  3. Step 3: Cross multiply
    718.47x = 991.67 × 438.75
  4. Step 4: Simplify right side
    718.47x = 435,093.02
  5. Step 5: Solve for x
    x = 435,093.02/718.47
  6. Step 6: Final answer
    x = 605.58

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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.