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Finding the Fourth Proportional to 659.90, 990.45 and 443.63

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Solution

The fourth proportional to 659.90, 990.45 and 443.63 is: 665.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.90 : 990.45 = 443.63 : x
  2. Step 2: Convert to fraction form
    659.90/990.45 = 443.63/x
  3. Step 3: Cross multiply
    659.90x = 990.45 × 443.63
  4. Step 4: Simplify right side
    659.90x = 439,393.33
  5. Step 5: Solve for x
    x = 439,393.33/659.90
  6. Step 6: Final answer
    x = 665.85

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Double scale
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1.5x scale

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.