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Finding the Fourth Proportional to 305.51, 458.28 and 143.15

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Solution

The fourth proportional to 305.51, 458.28 and 143.15 is: 214.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.51 : 458.28 = 143.15 : x
  2. Step 2: Convert to fraction form
    305.51/458.28 = 143.15/x
  3. Step 3: Cross multiply
    305.51x = 458.28 × 143.15
  4. Step 4: Simplify right side
    305.51x = 65,600.49
  5. Step 5: Solve for x
    x = 65,600.49/305.51
  6. Step 6: Final answer
    x = 214.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.