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Finding the Fourth Proportional to 431.04, 645.84 and 187.20

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Solution

The fourth proportional to 431.04, 645.84 and 187.20 is: 280.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.04 : 645.84 = 187.20 : x
  2. Step 2: Convert to fraction form
    431.04/645.84 = 187.20/x
  3. Step 3: Cross multiply
    431.04x = 645.84 × 187.20
  4. Step 4: Simplify right side
    431.04x = 120,901.25
  5. Step 5: Solve for x
    x = 120,901.25/431.04
  6. Step 6: Final answer
    x = 280.49

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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.