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Finding the Fourth Proportional to 1,490.89, 2,235.58 and 668.64

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Solution

The fourth proportional to 1,490.89, 2,235.58 and 668.64 is: 1,002.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.89 : 2,235.58 = 668.64 : x
  2. Step 2: Convert to fraction form
    1,490.89/2,235.58 = 668.64/x
  3. Step 3: Cross multiply
    1,490.89x = 2,235.58 × 668.64
  4. Step 4: Simplify right side
    1,490.89x = 1,494,798.21
  5. Step 5: Solve for x
    x = 1,494,798.21/1,490.89
  6. Step 6: Final answer
    x = 1,002.62

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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.