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Finding the Fourth Proportional to 345.36, 475.96 and 305.53

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Solution

The fourth proportional to 345.36, 475.96 and 305.53 is: 421.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.36 : 475.96 = 305.53 : x
  2. Step 2: Convert to fraction form
    345.36/475.96 = 305.53/x
  3. Step 3: Cross multiply
    345.36x = 475.96 × 305.53
  4. Step 4: Simplify right side
    345.36x = 145,420.06
  5. Step 5: Solve for x
    x = 145,420.06/345.36
  6. Step 6: Final answer
    x = 421.07

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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.