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Finding the Fourth Proportional to 659.19, 989.07 and 312.33

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Solution

The fourth proportional to 659.19, 989.07 and 312.33 is: 468.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.19 : 989.07 = 312.33 : x
  2. Step 2: Convert to fraction form
    659.19/989.07 = 312.33/x
  3. Step 3: Cross multiply
    659.19x = 989.07 × 312.33
  4. Step 4: Simplify right side
    659.19x = 308,916.23
  5. Step 5: Solve for x
    x = 308,916.23/659.19
  6. Step 6: Final answer
    x = 468.63

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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.