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Finding the Fourth Proportional to 306.16, 459.30 and 143.75

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Solution

The fourth proportional to 306.16, 459.30 and 143.75 is: 215.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.16 : 459.30 = 143.75 : x
  2. Step 2: Convert to fraction form
    306.16/459.30 = 143.75/x
  3. Step 3: Cross multiply
    306.16x = 459.30 × 143.75
  4. Step 4: Simplify right side
    306.16x = 66,024.38
  5. Step 5: Solve for x
    x = 66,024.38/306.16
  6. Step 6: Final answer
    x = 215.66

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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.