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Finding the Fourth Proportional to 991.95, 1,490.22 and 622.91

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Solution

The fourth proportional to 991.95, 1,490.22 and 622.91 is: 935.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.95 : 1,490.22 = 622.91 : x
  2. Step 2: Convert to fraction form
    991.95/1,490.22 = 622.91/x
  3. Step 3: Cross multiply
    991.95x = 1,490.22 × 622.91
  4. Step 4: Simplify right side
    991.95x = 928,265.49
  5. Step 5: Solve for x
    x = 928,265.49/991.95
  6. Step 6: Final answer
    x = 935.80

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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.