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Finding the Fourth Proportional to 313.50, 432.70 and 189.24

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Solution

The fourth proportional to 313.50, 432.70 and 189.24 is: 261.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.50 : 432.70 = 189.24 : x
  2. Step 2: Convert to fraction form
    313.50/432.70 = 189.24/x
  3. Step 3: Cross multiply
    313.50x = 432.70 × 189.24
  4. Step 4: Simplify right side
    313.50x = 81,884.15
  5. Step 5: Solve for x
    x = 81,884.15/313.50
  6. Step 6: Final answer
    x = 261.19

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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.