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Finding the Fourth Proportional to 310.68, 430.64 and 305.51

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Solution

The fourth proportional to 310.68, 430.64 and 305.51 is: 423.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.68 : 430.64 = 305.51 : x
  2. Step 2: Convert to fraction form
    310.68/430.64 = 305.51/x
  3. Step 3: Cross multiply
    310.68x = 430.64 × 305.51
  4. Step 4: Simplify right side
    310.68x = 131,566.67
  5. Step 5: Solve for x
    x = 131,566.67/310.68
  6. Step 6: Final answer
    x = 423.48

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.