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Finding the Fourth Proportional to 245.72, 368.64 and 123.68

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Solution

The fourth proportional to 245.72, 368.64 and 123.68 is: 185.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.72 : 368.64 = 123.68 : x
  2. Step 2: Convert to fraction form
    245.72/368.64 = 123.68/x
  3. Step 3: Cross multiply
    245.72x = 368.64 × 123.68
  4. Step 4: Simplify right side
    245.72x = 45,593.40
  5. Step 5: Solve for x
    x = 45,593.40/245.72
  6. Step 6: Final answer
    x = 185.55

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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.