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Finding the Fourth Proportional to 312.10, 430.75 and 187.86

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Solution

The fourth proportional to 312.10, 430.75 and 187.86 is: 259.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.10 : 430.75 = 187.86 : x
  2. Step 2: Convert to fraction form
    312.10/430.75 = 187.86/x
  3. Step 3: Cross multiply
    312.10x = 430.75 × 187.86
  4. Step 4: Simplify right side
    312.10x = 80,920.70
  5. Step 5: Solve for x
    x = 80,920.70/312.10
  6. Step 6: Final answer
    x = 259.28

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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.