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Finding the Fourth Proportional to 719.64, 991.18 and 621.22

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Solution

The fourth proportional to 719.64, 991.18 and 621.22 is: 855.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.64 : 991.18 = 621.22 : x
  2. Step 2: Convert to fraction form
    719.64/991.18 = 621.22/x
  3. Step 3: Cross multiply
    719.64x = 991.18 × 621.22
  4. Step 4: Simplify right side
    719.64x = 615,740.84
  5. Step 5: Solve for x
    x = 615,740.84/719.64
  6. Step 6: Final answer
    x = 855.62

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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.