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Finding the Fourth Proportional to 123.40, 171.43 and 123.40

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Solution

The fourth proportional to 123.40, 171.43 and 123.40 is: 171.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.40 : 171.43 = 123.40 : x
  2. Step 2: Convert to fraction form
    123.40/171.43 = 123.40/x
  3. Step 3: Cross multiply
    123.40x = 171.43 × 123.40
  4. Step 4: Simplify right side
    123.40x = 21,154.46
  5. Step 5: Solve for x
    x = 21,154.46/123.40
  6. Step 6: Final answer
    x = 171.43

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.