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Finding the Fourth Proportional to 659.12, 988.62 and 172.11

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Solution

The fourth proportional to 659.12, 988.62 and 172.11 is: 258.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.12 : 988.62 = 172.11 : x
  2. Step 2: Convert to fraction form
    659.12/988.62 = 172.11/x
  3. Step 3: Cross multiply
    659.12x = 988.62 × 172.11
  4. Step 4: Simplify right side
    659.12x = 170,150.74
  5. Step 5: Solve for x
    x = 170,150.74/659.12
  6. Step 6: Final answer
    x = 258.15

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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.