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Finding the Fourth Proportional to 431.67, 647.41 and 123.51

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Solution

The fourth proportional to 431.67, 647.41 and 123.51 is: 185.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.67 : 647.41 = 123.51 : x
  2. Step 2: Convert to fraction form
    431.67/647.41 = 123.51/x
  3. Step 3: Cross multiply
    431.67x = 647.41 × 123.51
  4. Step 4: Simplify right side
    431.67x = 79,960.99
  5. Step 5: Solve for x
    x = 79,960.99/431.67
  6. Step 6: Final answer
    x = 185.24

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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.