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Finding the Fourth Proportional to 1,660.10, 2,490.14 and 427.52

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Solution

The fourth proportional to 1,660.10, 2,490.14 and 427.52 is: 641.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,660.10 : 2,490.14 = 427.52 : x
  2. Step 2: Convert to fraction form
    1,660.10/2,490.14 = 427.52/x
  3. Step 3: Cross multiply
    1,660.10x = 2,490.14 × 427.52
  4. Step 4: Simplify right side
    1,660.10x = 1,064,584.65
  5. Step 5: Solve for x
    x = 1,064,584.65/1,660.10
  6. Step 6: Final answer
    x = 641.28

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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.