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Finding the Fourth Proportional to 659.04, 986.87 and 639.57

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Solution

The fourth proportional to 659.04, 986.87 and 639.57 is: 957.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.04 : 986.87 = 639.57 : x
  2. Step 2: Convert to fraction form
    659.04/986.87 = 639.57/x
  3. Step 3: Cross multiply
    659.04x = 986.87 × 639.57
  4. Step 4: Simplify right side
    659.04x = 631,172.45
  5. Step 5: Solve for x
    x = 631,172.45/659.04
  6. Step 6: Final answer
    x = 957.71

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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.