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Finding the Fourth Proportional to 313.40, 432.24 and 220.16

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Solution

The fourth proportional to 313.40, 432.24 and 220.16 is: 303.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.40 : 432.24 = 220.16 : x
  2. Step 2: Convert to fraction form
    313.40/432.24 = 220.16/x
  3. Step 3: Cross multiply
    313.40x = 432.24 × 220.16
  4. Step 4: Simplify right side
    313.40x = 95,161.96
  5. Step 5: Solve for x
    x = 95,161.96/313.40
  6. Step 6: Final answer
    x = 303.64

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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.