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Finding the Fourth Proportional to 659.04, 986.86 and 639.58

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Solution

The fourth proportional to 659.04, 986.86 and 639.58 is: 957.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.04 : 986.86 = 639.58 : x
  2. Step 2: Convert to fraction form
    659.04/986.86 = 639.58/x
  3. Step 3: Cross multiply
    659.04x = 986.86 × 639.58
  4. Step 4: Simplify right side
    659.04x = 631,175.92
  5. Step 5: Solve for x
    x = 631,175.92/659.04
  6. Step 6: Final answer
    x = 957.72

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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.