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Finding the Fourth Proportional to 345.48, 476.52 and 221.28

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Solution

The fourth proportional to 345.48, 476.52 and 221.28 is: 305.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.48 : 476.52 = 221.28 : x
  2. Step 2: Convert to fraction form
    345.48/476.52 = 221.28/x
  3. Step 3: Cross multiply
    345.48x = 476.52 × 221.28
  4. Step 4: Simplify right side
    345.48x = 105,444.35
  5. Step 5: Solve for x
    x = 105,444.35/345.48
  6. Step 6: Final answer
    x = 305.21

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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.