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Finding the Fourth Proportional to 332.78, 458.53 and 309.69

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Solution

The fourth proportional to 332.78, 458.53 and 309.69 is: 426.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    332.78 : 458.53 = 309.69 : x
  2. Step 2: Convert to fraction form
    332.78/458.53 = 309.69/x
  3. Step 3: Cross multiply
    332.78x = 458.53 × 309.69
  4. Step 4: Simplify right side
    332.78x = 142,001.38
  5. Step 5: Solve for x
    x = 142,001.38/332.78
  6. Step 6: Final answer
    x = 426.72

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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.