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Finding the Fourth Proportional to 991.58, 1,489.66 and 622.53

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Solution

The fourth proportional to 991.58, 1,489.66 and 622.53 is: 935.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.58 : 1,489.66 = 622.53 : x
  2. Step 2: Convert to fraction form
    991.58/1,489.66 = 622.53/x
  3. Step 3: Cross multiply
    991.58x = 1,489.66 × 622.53
  4. Step 4: Simplify right side
    991.58x = 927,356.48
  5. Step 5: Solve for x
    x = 927,356.48/991.58
  6. Step 6: Final answer
    x = 935.24

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.