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Finding the Fourth Proportional to 1,490.97, 2,235.90 and 657.21

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Solution

The fourth proportional to 1,490.97, 2,235.90 and 657.21 is: 985.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.97 : 2,235.90 = 657.21 : x
  2. Step 2: Convert to fraction form
    1,490.97/2,235.90 = 657.21/x
  3. Step 3: Cross multiply
    1,490.97x = 2,235.90 × 657.21
  4. Step 4: Simplify right side
    1,490.97x = 1,469,455.84
  5. Step 5: Solve for x
    x = 1,469,455.84/1,490.97
  6. Step 6: Final answer
    x = 985.57

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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.