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Finding the Fourth Proportional to 312.85, 431.72 and 188.51

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Solution

The fourth proportional to 312.85, 431.72 and 188.51 is: 260.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.85 : 431.72 = 188.51 : x
  2. Step 2: Convert to fraction form
    312.85/431.72 = 188.51/x
  3. Step 3: Cross multiply
    312.85x = 431.72 × 188.51
  4. Step 4: Simplify right side
    312.85x = 81,381.38
  5. Step 5: Solve for x
    x = 81,381.38/312.85
  6. Step 6: Final answer
    x = 260.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.