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Finding the Fourth Proportional to 431.51, 647.41 and 157.61

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Solution

The fourth proportional to 431.51, 647.41 and 157.61 is: 236.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.51 : 647.41 = 157.61 : x
  2. Step 2: Convert to fraction form
    431.51/647.41 = 157.61/x
  3. Step 3: Cross multiply
    431.51x = 647.41 × 157.61
  4. Step 4: Simplify right side
    431.51x = 102,039.51
  5. Step 5: Solve for x
    x = 102,039.51/431.51
  6. Step 6: Final answer
    x = 236.47

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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.