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Finding the Fourth Proportional to 172.40, 257.62 and 124.40

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Solution

The fourth proportional to 172.40, 257.62 and 124.40 is: 185.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    172.40 : 257.62 = 124.40 : x
  2. Step 2: Convert to fraction form
    172.40/257.62 = 124.40/x
  3. Step 3: Cross multiply
    172.40x = 257.62 × 124.40
  4. Step 4: Simplify right side
    172.40x = 32,047.93
  5. Step 5: Solve for x
    x = 32,047.93/172.40
  6. Step 6: Final answer
    x = 185.89

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.