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Finding the Fourth Proportional to 431.12, 646.90 and 187.81

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Solution

The fourth proportional to 431.12, 646.90 and 187.81 is: 281.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.12 : 646.90 = 187.81 : x
  2. Step 2: Convert to fraction form
    431.12/646.90 = 187.81/x
  3. Step 3: Cross multiply
    431.12x = 646.90 × 187.81
  4. Step 4: Simplify right side
    431.12x = 121,492.20
  5. Step 5: Solve for x
    x = 121,492.20/431.12
  6. Step 6: Final answer
    x = 281.80

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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.