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Finding the Fourth Proportional to 659.02, 986.46 and 439.21

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Solution

The fourth proportional to 659.02, 986.46 and 439.21 is: 657.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.02 : 986.46 = 439.21 : x
  2. Step 2: Convert to fraction form
    659.02/986.46 = 439.21/x
  3. Step 3: Cross multiply
    659.02x = 986.46 × 439.21
  4. Step 4: Simplify right side
    659.02x = 433,263.10
  5. Step 5: Solve for x
    x = 433,263.10/659.02
  6. Step 6: Final answer
    x = 657.44

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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.