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Finding the Fourth Proportional to 313.90, 432.36 and 261.34

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Solution

The fourth proportional to 313.90, 432.36 and 261.34 is: 359.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.90 : 432.36 = 261.34 : x
  2. Step 2: Convert to fraction form
    313.90/432.36 = 261.34/x
  3. Step 3: Cross multiply
    313.90x = 432.36 × 261.34
  4. Step 4: Simplify right side
    313.90x = 112,992.96
  5. Step 5: Solve for x
    x = 112,992.96/313.90
  6. Step 6: Final answer
    x = 359.96

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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.