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Finding the Fourth Proportional to 313.02, 431.63 and 213.50

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Solution

The fourth proportional to 313.02, 431.63 and 213.50 is: 294.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.02 : 431.63 = 213.50 : x
  2. Step 2: Convert to fraction form
    313.02/431.63 = 213.50/x
  3. Step 3: Cross multiply
    313.02x = 431.63 × 213.50
  4. Step 4: Simplify right side
    313.02x = 92,153.01
  5. Step 5: Solve for x
    x = 92,153.01/313.02
  6. Step 6: Final answer
    x = 294.40

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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.