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Finding the Fourth Proportional to 659.82, 989.31 and 312.94

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Solution

The fourth proportional to 659.82, 989.31 and 312.94 is: 469.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.82 : 989.31 = 312.94 : x
  2. Step 2: Convert to fraction form
    659.82/989.31 = 312.94/x
  3. Step 3: Cross multiply
    659.82x = 989.31 × 312.94
  4. Step 4: Simplify right side
    659.82x = 309,594.67
  5. Step 5: Solve for x
    x = 309,594.67/659.82
  6. Step 6: Final answer
    x = 469.21

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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.