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Finding the Fourth Proportional to 431.03, 646.58 and 122.92

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Solution

The fourth proportional to 431.03, 646.58 and 122.92 is: 184.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.03 : 646.58 = 122.92 : x
  2. Step 2: Convert to fraction form
    431.03/646.58 = 122.92/x
  3. Step 3: Cross multiply
    431.03x = 646.58 × 122.92
  4. Step 4: Simplify right side
    431.03x = 79,476.30
  5. Step 5: Solve for x
    x = 79,476.30/431.03
  6. Step 6: Final answer
    x = 184.39

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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.