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Finding the Fourth Proportional to 431, 646.64 and 187.56

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Solution

The fourth proportional to 431, 646.64 and 187.56 is: 281.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    431 : 646.64 = 187.56 : x
  2. Step 2: Convert to fraction form
    431/646.64 = 187.56/x
  3. Step 3: Cross multiply
    431x = 646.64 × 187.56
  4. Step 4: Simplify right side
    431x = 121,282.86
  5. Step 5: Solve for x
    x = 121,282.86/431
  6. Step 6: Final answer
    x = 281.40

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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.