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Finding the Fourth Proportional to 431.33, 646.99 and 123.19

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Solution

The fourth proportional to 431.33, 646.99 and 123.19 is: 184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.33 : 646.99 = 123.19 : x
  2. Step 2: Convert to fraction form
    431.33/646.99 = 123.19/x
  3. Step 3: Cross multiply
    431.33x = 646.99 × 123.19
  4. Step 4: Simplify right side
    431.33x = 79,700.77
  5. Step 5: Solve for x
    x = 79,700.77/431.33
  6. Step 6: Final answer
    x = 184.78

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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.