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Finding the Fourth Proportional to 305.39, 458.15 and 143.12

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Solution

The fourth proportional to 305.39, 458.15 and 143.12 is: 214.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.39 : 458.15 = 143.12 : x
  2. Step 2: Convert to fraction form
    305.39/458.15 = 143.12/x
  3. Step 3: Cross multiply
    305.39x = 458.15 × 143.12
  4. Step 4: Simplify right side
    305.39x = 65,567.42
  5. Step 5: Solve for x
    x = 65,567.42/305.39
  6. Step 6: Final answer
    x = 214.70

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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.