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Finding the Fourth Proportional to 431.08, 646.62 and 286.36

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Solution

The fourth proportional to 431.08, 646.62 and 286.36 is: 429.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.08 : 646.62 = 286.36 : x
  2. Step 2: Convert to fraction form
    431.08/646.62 = 286.36/x
  3. Step 3: Cross multiply
    431.08x = 646.62 × 286.36
  4. Step 4: Simplify right side
    431.08x = 185,166.10
  5. Step 5: Solve for x
    x = 185,166.10/431.08
  6. Step 6: Final answer
    x = 429.54

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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.