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Finding the Fourth Proportional to 716.64, 989.18 and 619.44

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Solution

The fourth proportional to 716.64, 989.18 and 619.44 is: 855.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.64 : 989.18 = 619.44 : x
  2. Step 2: Convert to fraction form
    716.64/989.18 = 619.44/x
  3. Step 3: Cross multiply
    716.64x = 989.18 × 619.44
  4. Step 4: Simplify right side
    716.64x = 612,737.66
  5. Step 5: Solve for x
    x = 612,737.66/716.64
  6. Step 6: Final answer
    x = 855.01

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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.