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Finding the Fourth Proportional to 313.64, 432.79 and 189.35

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Solution

The fourth proportional to 313.64, 432.79 and 189.35 is: 261.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.64 : 432.79 = 189.35 : x
  2. Step 2: Convert to fraction form
    313.64/432.79 = 189.35/x
  3. Step 3: Cross multiply
    313.64x = 432.79 × 189.35
  4. Step 4: Simplify right side
    313.64x = 81,947.77
  5. Step 5: Solve for x
    x = 81,947.77/313.64
  6. Step 6: Final answer
    x = 261.28

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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.