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Finding the Fourth Proportional to 659.84, 989.70 and 172.94

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Solution

The fourth proportional to 659.84, 989.70 and 172.94 is: 259.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.84 : 989.70 = 172.94 : x
  2. Step 2: Convert to fraction form
    659.84/989.70 = 172.94/x
  3. Step 3: Cross multiply
    659.84x = 989.70 × 172.94
  4. Step 4: Simplify right side
    659.84x = 171,158.72
  5. Step 5: Solve for x
    x = 171,158.72/659.84
  6. Step 6: Final answer
    x = 259.39

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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.