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Finding the Fourth Proportional to 431.81, 647.64 and 123.62

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Solution

The fourth proportional to 431.81, 647.64 and 123.62 is: 185.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.81 : 647.64 = 123.62 : x
  2. Step 2: Convert to fraction form
    431.81/647.64 = 123.62/x
  3. Step 3: Cross multiply
    431.81x = 647.64 × 123.62
  4. Step 4: Simplify right side
    431.81x = 80,058.02
  5. Step 5: Solve for x
    x = 80,058.02/431.81
  6. Step 6: Final answer
    x = 185.40

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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.