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Finding the Fourth Proportional to 313.59, 432.75 and 189.21

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Solution

The fourth proportional to 313.59, 432.75 and 189.21 is: 261.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.59 : 432.75 = 189.21 : x
  2. Step 2: Convert to fraction form
    313.59/432.75 = 189.21/x
  3. Step 3: Cross multiply
    313.59x = 432.75 × 189.21
  4. Step 4: Simplify right side
    313.59x = 81,880.63
  5. Step 5: Solve for x
    x = 81,880.63/313.59
  6. Step 6: Final answer
    x = 261.11

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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.