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Finding the Fourth Proportional to 659.63, 990.04 and 269.90

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Solution

The fourth proportional to 659.63, 990.04 and 269.90 is: 405.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.63 : 990.04 = 269.90 : x
  2. Step 2: Convert to fraction form
    659.63/990.04 = 269.90/x
  3. Step 3: Cross multiply
    659.63x = 990.04 × 269.90
  4. Step 4: Simplify right side
    659.63x = 267,210.39
  5. Step 5: Solve for x
    x = 267,210.39/659.63
  6. Step 6: Final answer
    x = 405.09

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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.