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Finding the Fourth Proportional to 431.51, 647.19 and 157.57

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Solution

The fourth proportional to 431.51, 647.19 and 157.57 is: 236.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.51 : 647.19 = 157.57 : x
  2. Step 2: Convert to fraction form
    431.51/647.19 = 157.57/x
  3. Step 3: Cross multiply
    431.51x = 647.19 × 157.57
  4. Step 4: Simplify right side
    431.51x = 101,976.11
  5. Step 5: Solve for x
    x = 101,976.11/431.51
  6. Step 6: Final answer
    x = 236.33

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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.